Achievement Whores/Boosters read on, the rest please continue with your daily lives...

So with 75% done I am hoping that I will get most, if not all, of the rest done today. It's hard for me to predict how far I will get as there are many factors that come into play that determine how far I will get. Looking at the achievements description doesn't always give the full story so sometimes I have to do some research into what the achievement entails so for some games it may take awhile to gather the necessary information. Oh well I guess I'll just bite the bullet and start right now...

Onechanbara: Bikini Samurai Squad
No Online Multiplayer Achievements
Weird Japanese game being brought to the US. Just looking at the achievements it seems to me that there are no multiplayer achievements but as this game isn't out yet I may be wrong. A game like this probably has online co-op but I don't really know as if I were the producers of this game I wouldn't have brought it to the US as this game's niche market is only in Japan.

Open Season
No Online Multiplayer Achievements

Operation Darkness
1 Online Mulitplayer Achievement for 20 Points
Just play online once... [2 People]

Over G Fighters
No Online Multiplayer Achievements

Overlord
11 Online Multiplayer Achievements for 260 Points
3 Achievements [60 Points] for surviving for 30 Minutes in Co-op Survival [2 Players]. 4 Achievements [100 Points] for 50 Wins in Pillage matches [2 Players]. 4 Achievements [100 Points] for 50 Wins in Slaughter matches [2 Players].
DLC - 3 Online Multiplayer Achievements for 60 Points [Stack with the original game if doing these first...]
20 Points lasting 45 Minutes in an Expansion Survival Map, 20 Points for 25 Wins in Expansion Pillage Maps, and 20 Points for 25 Wins in Expansion Slaughter Maps...

PDC World Championship Darts
3 Online Multiplayer Achievements for 55 Points
Just your basic ranked win achievements and as this game is just darts I assume they can all be done with just 2 people.

Perfect Dark Zero
Lots of online multiplayer achievements for this game but they are pretty straight forward but very tedious and time consuming. First there is the story/campaign mode in co-op then there is the deathmatch style multiplayer. The co-op story in this game is of a decent difficulty level so getting a good partner will help alot. As for the rest of the online achievements they are pretty easy, it just takes very long. So all of the online multiplayer achievements can be done with just 2 people.

Phantasy Star Universe
No Online Multiplayer Achievements
DLC - 5 Online Multiplayer Achievements for 250 Points
The DLC is actually an expansion for the MMORPG of this game. As in all MMOs you require a decent enough group to accomplish most of the tasks...

Pimp My Ride
No Online Multiplayer Achievements

Pirates of the Caribbean: At World's End
No Online Multiplayer Achievements

Prey
17 Online Multiplayer Achievements for 250 Points
All of these multiplayer achievements can be done easily with just 2 people... Basically its just kills with specific weapons and a bunch of ranked wins so its nothing too difficult just tedious...

Prince of Persia
No Online Multiplayer Achievements

Pro Evolution Soccer 2008 [All Regions]
4 Online Multiplayer Achievements for 270 Points
2 Achievements [170 Points] for 20 Ranked Wins, 1 Achievement [50 Points] for getting a Free Kick goal (without touching the keeper or the post), and finally 1 Achievement [50 Points] for getting a hat-trick. All of these achievements are obtainable with just 2 people.

Pro Evolution Soccer 2009 [All Regions]
8 Online Multiplayer Achievements for 180 Points
3 Online Achievements [65 Points] can be done with just 2 people, 20 Wins and a Hat Trick... The other 5 achievements [115 Points] requires 4 people and these achievements require 34 games played and a few require certain point values while playing the game.

Pro Evolution Soccer 6
6 Online Multiplayer Achievements for 300 Points
2 Different Online Gametypes and 100 wins for each of them... Can be done with just 2 people but it will take quite a bit of time [quittable]...

Project Gotham Racing 3
7 Online Multiplayer Achievements for 190 Points
"Gotham Hero" is random as the servers randomly choose races that are going on to broadcast but as this game is very old now not many people race so this can be gotten within 1-3 races... The 2 cat & mouse achievements require 3v3 to launch so you need 6 people... The cone achievements can be done with just 2 people... The online career achievements require atleast 4 people but as the matchmaking in this game is kinda weird it may take more...

Project Gotham Racing 4
7 Online Multiplayer Achievements for 105 Points
Viral Achievement - "Beat Bizarre"
A bunch of stuff is required to get all of the achievements and a couple of these achievements require 8 people while the rest can be complete with 2 or 6 players depending on the gametype mode...

Project Sylpheed
No Online Multiplayer Achievements

Pure
4 Online Multiplayer Achievements for 100 Points
5 Wins, Beating an A engine with a D engine in ranked play, and a online championship win can technically all be done with just 2 players... The ranked one requires more to launch the game but since you don't need to win just beat someone with an A engine it can still be done...

Quake 2
9 Achievements for 0 Points
No Online Multiplayer Achievements

Quake 4 [All Regions]
I really hate achievements that require you to be somewhere on the leaderboards... Similar to GRAW you need to be #1 to get all the online achievements in this game but using the glitch it is technically possible if the person who is currently #1 would stop boosting himself when people get close... The glitch requires 4 people but all the other achievements you can do them with just 2 people...

Quantum of Solace
19 Online Multiplayer Achievements for 365 Points
Lots of multiplayer achievements that basically amount to kills and wins so just keep playing... Requires 8 people to launch a ranked game...

Race Driver: GRID
6 Online Multiplayer Achievements for 175 Points
Viral Achievement - "Beat Codies"
Ranking up nets you some achievement points, but you have to get to Legend [2000 exp] to get the 2nd and final rank achievement... 3 more achievements are win achievements and luckily its only 5 wins to get two of the achievements but the third one is to get a win with each of the 8 Ball Pack cars... The last achievement is the viral... Getting everything but the ranks is possible with just 2 people. The ranks are alot quicker if you do them legit in Destruction Derby races. It is possible to do it with just 2 people but unless the other person is of a really high rank you will only get like 1 point a match...

RACE Pro
Lots of online multiplayer in this game and since this game isn't out yet I do not know how many people are required to launch the games... Looks like you have to host 50 Ranked games, 50 Player Matches, and a couple HotSeat games... I'll update this once more information is available...

Rainbow Six Vegas
Lots of multiplayer achievements in this game and technically you can do all but one of the achievements with just 2 people but having more people makes alot of them a million times faster to get, especially the rank ones... The last achievement is to host a 16 Player match...

Rainbow Six Vegas 2 [All Regions]
23 Online Multiplayer Achievements for 405 Points
All of the achievements are basically just wins and kills and they require 6 people for them to unlock...

Rapala Fishing Frenzy
No Online Multiplayer Achievements

Rapala Tournament Fishing
No Online Multiplayer Achievements

Ratatouille
No Online Multiplayer Achievements

Rayman Raing Rabbids
No Online Multiplayer Achievements

Ridge Racer 6
3 Online Multiplayer Achievements for 160 Points
These 3 achievements will unlock after you get 200 online wins, but if you play till you get 230 online wins you will also unlock about 300 more points as for every 10 wins you get you get a new card and there are 23 cars to unlock which in turn unlock achievements... These wins can be done with just 2 people...

Rise of the Argonauts
No Online Multiplayer Achievements

Robert Ludlum's The Bourne Conspiracy
No Online Multiplayer Achievements

Rock Band
4 Online Multiplayer Achievements for 100 Points
Lots of LOCAL multiplayer achievements as this is a band game... 20 Tug of War wins and 20 Score Duel wins which can be done with just 2 people...

Rock Band 2
2 Online Mulitplayer Achievements for 30 Points
Well this game actually has lots of online multiplayer but these 2 are the ones that require you to be online, while the others you can do LOCALLY... One of these achievements is to beat the person who just beat you and the other achievement is to beat a player so these achievements are alot easier than this game's predecessor...

Rock Revolution
10 Online Multiplayer Achievements for 150 Points
Win 50 Games and Play 100 Games and as long as the person is on your friends list and you get atleast one game with 100% and play one game 3v3 [3 local versus their 3 locals] you will get all 10 achievements... All of these can be done with just 2 people...

Rockstar Table Tennis
7 Online Multiplayer Achievements for 370 Points
Most of these can be done with just 2 people but will take quite a long time unless your friend is of a high rank in the game... The 50 Tournament wins will take some time and it requires 4 people to start...

RTL Winter Sports 2009
No Online Multiplayer Achievements

Rumble Roses Double X
No Online Multiplayer Achievements

Saints Row [All Regions]
7 Online Multiplayer Achievements for 180 Points
A couple of co-op achievements that can be done with just 2 people. The rest of the gametypes require at least 4 people but if you want to get "Kingpin" relatively quickly you should try and do the glitch which requires 6 people...

Saints Row 2 [All Regions]
Quite a few online achievements and since basically the whole game can be played in co-op you should find a good friend and do the campaign and the multiplayer achievements. Most if not all the online multiplayer can be done with just 2 people...

Samurai Warriors 2 [All Regions]
No Online Multiplayer Achievements

Samurai Warriors 2 Empires
No Online Multiplayer Achievements

SBK 08: Superbike World Championship [All Regions]
4 Online Multiplayer Achievements for 200 Points
Just get 10 wins and lose 5... These achievements can be done with just 2 people...

Scene It? Box Office Smash
3 Online Multiplayer Achievements for 45 Points
Just win 10 online games and you will net all 3 of the achievements... These can all be done with just 2 people...

Scene It? Lights Camera Action
No Online Multiplayer Achievements
All of the achievements can be obtained in local multiplayer...

SCORE International Baja 1000
No Online Multiplayer Achievements
Some achievements will unlock if you play online but since they are all capable of being unlocked in career I just put 0 achievements for this one...

Secret Service
No Online Multiplayer Achievements

SEGA Mega Drive Ultimate Collection
No Online Multiplayer Achievements

Sega Rally Revo
5 Online Multiplayer Achievements for 150 Points
Technically you only need to do 2 achievements online [10 Ranked wins] as the other achievements [100 Played Matches] can be done in unranked and versus the AI... The ranked wins can be done with just 2 people...

Sega Superstars Tennis
7 Online Multiplayer Achievements for 140 Points
So you need to win 10 ranked games and 10 player matches these are easily done with another person. The tournament can be setup to play versus an AI so the only thing left to do is to spectate someone else's ranked game and have someone else watch your ranked game... These achievements can all be done with just 2 people [unless you count the spectate one in which you will probably need 1 other person to play against while you and your friend take turns watching each other]...

Shadowrun
Lots of multiplayer in this game so it will take quite awhile to get all the online points in this game... One of the things that causes this to take alot of time is to get a group of 8 people together which is how many the game requires to launch the game...

I'm a little tired today so I'll stop here...