So I havn't posted in awhile... Been busy playing Culdcept Saga because Keytta told me to boost the online wins with him... So when he's not around I've been playing the single player. It seems to me it will take about 100 hours+ to finish off the single player part mostly because of the clothing parts which require over 100 single player wins...

I thought I would read through the lists of achievements of games little by little and look for achievements that require online play... I'll further seperate them into 1-2 people boostable / 3 - 6 needed / 7+ needed... [The 7+ are achievements I hate there are only a handful of games out there that carry a large enough following]...

So I won't go through the whole list in one day but I think I'll do a little at a time like right now I'll try and do the As and Bs... Also this is just my record for now... I have also signed up for x360a's GSL VII which is a gamerscore league so I hope I get picked for a team... If I do get picked up for a team and I do end up playing I will make a more in depth list of achievements [ones that are instant / take very little time / medium amount of time / etc...]

I despise multiplayer achievements because I need the help of other people or have to schedule a time to meet with others. I enjoy co-op achievements that unlock for both players as those only require 2 people and getting just 1 person to boost/co-op with is pretty easily accomplished...
[I get my info from x360a]

2006 FIFA World Cup
No Multiplayer
50 Cent: Blood on the Sand
Looks like it is all single player except a few achievements can be completed in co-op mode if so deemed...

A-Train HX
No Multiplayer

Ace Combat 6
Lots of multiplayer but it seems all can be done in player matches and co-op matches... 2 ppl boosting

Found this in the forums...
1. create a private match for you and your boosting partner
2. set it to team battle map 1
3. set timer for 5 minutes
4. both pick the f-22 with xm4g missles
5. start the game, have player 1(person who wants win) kill player 2 right off the bat and then crash.
6. now both planes will spawn facing eachother at the same altitude so after that first kill dont even move the analog stick, now keep flying straight at eachother, once in range for xm4g missles (25,000ft) both fire at the same time, and you kill kill eachother exchanging kills.

now if you do this properly one person will get 10 kills and one with 9 after the round. great for boosting wins + kills and pretty fast

Afro Samurai
No Multiplayer

Alarm for Cobra 11: Burning Wheels
No Multiplayer

Alarm for Cobra 11: Crash Time US / EU
No Multiplayer

All Pro Football 2K8
Wins = 2 Players... League / Tournament is 8 players

Alone in the Dark
No Multiplayer

America's Army: True Soldiers
All of the multiplayer is 4+ players...

American Wasteland
Online requires 2 people

Amped 3
No Multiplayer

Armored Core 4
No Multiplayer

Armored Core for Answer
No Multiplayer

Army of Two [Asia / EU / US]
Co-op is two people
Online Requires 4 people from your Region

Assassin's Creed
No Multiplayer

Asterix at the Olympic Games
No Multiplayer

Avatar: The Burning Earth
No Multiplayer

I'm stopping at the A's lol it was a longer list than I thought I'll continue this tomorrow or actually later today... So far the list isn't too bad APF 2K8 requires 8 people but they just need to sign up and dont have to actually play anything for the league and tourny achievements and I already have em... Ace Combat [2 ppl] and American Army [4 ppl] seem to be time consuming boring boosting online and Army of Two the online achievements aren't too bad exceot for the 1 Billion Dollar ones [all region specific so you can do it 3 times] Well that's all for now...