mine has to be this  Defeat the Ethereal Queen in star ocean took me 6hrs straight and couldnt not have saved to go home aganist the toughest boss

for me it was fairly recently, I got the trophies for "chip-in" and "eagle" in the same shot in みんなのGOLF 6... it was amazing o.o still working on my hole-in-one trophy though :p

edit: that or any trophy in Dark Souls or Under Defeat -.-"

C'est Magnifique! - You completed Score Attack Mode with all characters (Persona 4 Arena)

Took almost 2 solid months of effort before I pulled this off. You really need to have played the game to understand how ridiculously cheap most of the opponents in this mode are. Completing it with all 13 characters practically drove me batty.

no real favourites but few of them:

hexic hd: grand pearl poo-bah (surround a piece with six black pearls)
i was also in the top 50 with my old account which i think was great because everyone had the game installed on the 360. but i never got the achievement for 100 games but i played many more wtf?)

rockstar table tennis: beat all-star circuit with every character (lol)

pgr3: platinum champion

kameo: all those "a" rankings

and one thing i will probably never understand is why people boost their scores and watch videos to get trophies/achivements. doesn't sound like an achievemnt anymore then.

I ENVY YOUR NGS 2 PLAT BUT I CANT HANDLE THOSE MULTI PLAYER STAGES DAMNNN THEY HARD

Completed COD:WAW on veteran

spend hours on 1 checkpoint...

and i cant even get the plat because i cant find anyone online for the Co-op trophys and i have no freind's

i got the co-op trophys but give up on the  veteran if u wa i can help u witht that

If u got platinum then great job.

I can´t pick one since i have many :P

Nah it's all good u need like 4 ppl anyway, thx tho

na dude that 100% battle trphies is killing me!