[quote name='HaLLuZiNaTiOnZ']Demolition Man trophy is a bitch. I owned the game at one point and the multiplayer was fun, but then the Demoltion Man trophy stopped me from trying(and that my friends didn't have it so nobody to multi with). You have to place C4 around a house and HOPE somebody enters it, then blow it up and get the kill by crushing them with the house.[/QUOTE]
I found that the best way to do it is (while playing the mode where you blow up M-Com stations). Playing as sniper, rig the house with C4 (from the outside) and toss a motion tracker, then activate the M-Com. Blow the C4 when the enemies are close to the building but not inside yet, otherwise a) you'll kill them with the C4 blast and b) you give them time to run away, if you blow it before they go in the house there's a bigger chance that the damn thing will fall on their heads, specially if they're deactivating the M-Com