Not sure if anyone even plays this anymore but just in case, I've discovered a helpful tip:
For "Total Fist Bump Destruction" and "Total Fist Bump Deflation," you do NOT have to replay the entire game. You can simply redo the last mission from the last checkpoint and get both trophies. All you have to do is make sure you have a friendship status of "ambiguous ________" for the first scenario and then "hateful __________" for the alternate scenario.
If anyone can help with the multiplayer trophies, please send friend request with Army of Two in subject line to nismo1219.