Oh boy there we go. Hardest ones are in bold.
Also note that I do NOT use guides. I still believe in the fact that you should experience and find everything yourself. Makes games much more fun. Making some a bit harder then you might think.
Super Mario World : 100%, unlocked and finished every stage.
Super Mario Kart: fully completed the game on highest CC with every character.
Donkey Kong Countery 1,2,3: Fully completed all games with all DK coins/Bonus coins.
Metroid Fusion, Other M, Zero Mission, Super, Prime 1,2,3: Fully completed game on highest difficulty setting and 100% items and 100% scans. Also did speedruns on several of them.
Legend of Zelda Wind Waker: All secrets and pieces of heart.
Mirror's Edge: 3 stars on every time trial, completed every speedrun, every package found, completed on hard. The speedruns were insanely hard to do.
Resident Evil 4, and semi 5: completed on every difficulty, completed KnifeRun only on highest difficulty (RE4), completed FreshProRun (RE5), unlocked all weapons to max, all treasures etc. Highest amount of stars on every Merc stage with every character(RE4) and S rating on every stage with one character (RE5)
Splinter Cell 1,2,3 and kinda 4: Completed every mission in 1 'till 3 without using gadgets on hardest difficulty without being seen. In Double Agent I got a 100% rating on every mission except the last one which was bugged so it was impossible.
Prince of Persia SoT, WW, TT, FS: Collected everything, beaten on all difficulties and beaten all games without using sands.
Demon's Souls: Completed the game untill NG+10, have every weapon atleast 4 times, every spell, every miracle, every weapon upgrade done, current gear maxed out.
Would have been a lot easier with guides I think, since finding every teacher and secret took some serious searching. How they ever thought people would find Yuria on their own was beyond me. Took me weeks xD
Star Wars Rogue Leader (Gamecube): beaten on highest difficulty, including that secret one (arcade was it called?) and unlocked every mission. Highest medal on every mission.
James Bond Agent under Fire / nightfire: Platinum Medal on every mission.
Beyond Good and Evil: speedrunned in 4 hours, got every pearl, photograph and completed every minigame 100%.
Baten Kaitos: Got every card in the game. Nuff said. This is insanely hard since around 1/5th of all the 2000+ cards are missable and you won't get a second chance.
MW2: Seriously, who doesn't?
Batman Arkham Asylum: Beaten the game on hard without gadgets and taking damage, completed everything there was to complete and found all riddles.
Heavy Rain: Seen all endings.
Pokemon Blue and Gold: Got a 100% pokedex.
Infamous: simply got everything.
Uncharted 2: The designers were pretty darn good at hiding those treasures. Took me a while to find them.
HONERABLE MENTIONS:
Bayonetta: Got around 100% on the character Bayonetta (still need to get Pure Platinum on some stages). But haven't started with Jean and Zero yet.
Borderlands: Completed everything with Soldier class. Not the other ones.
FZero GX: Completed every Cup on Master Difficulty and completed the entire campaign on Hard. I consider this good enough to get a mention. Completing the campaign on Very Hard was just too much for me sorry.
And before people ask. I don't buy a lot of games due to money issues. So when I buy a game, I try to get as much out of it as humanly possible. Hence my lust for 100%.
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