List the achivements which make you EXTREMELY PROUD

The one where you complete Revenholm without guns , i'm proud of it than finding all Lambdas .

I finished 100% of Xotic achievements last week. I nice game though not particularly hard. The bit I am proud about was I completed a friendly challenge. X was the last letter I needed to complete 100% of achievements for games starting with each letter of the alphabet.
[100% games](http://www.metagamerscore.com/game?completist=1&user=593eg: http://www.steamgifts.com)

Not what they signed up for - Magicka. It's not hard, but the achievements of this game is so buggy that it took me a couple of months to get them all.

One year - Universe Sandbox
Queen hatshepsut- Serious Sam 3 Bfe
Unstoppable - Cave Story +
The Shadows Rushed Me - Max Payne 3
Platinum God- Basement Collection
Platinum God- The Binding of Isaac
Golden God , Impossible boy and Zombie boy - Super meat boy

"Married" - Get Married in Skyrim.

... ;__;

The Binding of Isaac - Golden God (Platinum God will come someday)
Super House of Dead Ninjas - "Multi Millionaire" score 2million in a single game
Psychonauts - "I Thought That Was Unbeatable" Complete Meat Circus

"Sknifed" - Counter Strike:GO (kill a zoomed in sniper with a knife)
"Everythings Terrible" - The Binding of Isaac (complete the full game 6 times)
"Goliath, Meet David" - borderlands 2 (allow a goliath to level up 4 times before killing him)

actually, it's super easy to kill a GOD-Liath in BL2, but it's pretty hard and annoying to level him up to that state...

Gotta Break Em In - Saints Row The Third. BooBies what else is there to be said

Aperture Science - Portal. This one cost me couple of weeks, but damn, it is worth every second =)

Pure Gold - Sleeping Dogs. Pretty easy, but honorable anyway =)

Lambda Locator - Half-life 2. A pain to find, especially on my own =)

Angelic Flight - Splice. No comment =)

Speed Run - Braid
Oh, the frustration of reaching the end 1 minute past the required time. ;__;

unfortunately I stopped caring about achievements after I left xbox but here is some I am proud of (on xbox)

Halo Reach
Bounty Hunter
Anniversary: Captured 10 skulls at once in a matchmade Headhunter game - sounds easy but takes practice and skill to get this

A Monument to All Your Sins
Completed every mission in Halo: Reach alone, on Legendary.

Dorito's Crash Course
Sore wa kantan desu
Finished Japan level 4 with a time of 1:40 or better - this too me ages

Halo 3: ODST
Vidmaster Challenge: Endure
In Firefight, on any mission, passed the 4th Set on 4-player Heroic LIVE co-op. - was very hard

Check my Steam profile :3

Resident Evil 5. Headshot an enemy in midair. It was the last one I needed so I got the Platinum trophy after that. Yeah, I was playing on the PS3 if you didn't catch on already.

My platinum trophies in my Ps3, specially Dead Space 2 and its "beating the game in impossible" trophy.

I don't have many on steam though.

Payday 1: I pushed the button and lived, before the level cap was raised.

Probably one of the Super Meat Boy achievements, like finishing the game 100%, when I started the game I never thought I'd actually go through with it.

Spelunky: low scorer (Collect not one single piece of treasure in a full run).
Basement collection: platinum god (100% the game, which is hell due to "enter the unknown" in time kufc ).
The binding of Isaac: Platinum god (100%)
Super meat boy: Golden god (100%)
Half life 2 episode 1: The one free bullet (Beat the game shooting only one bullet. Achievement had shown gravity gun, crowbar, RPG, and grenades were ok).
Half life 2: lambda locator (Found all secret lambda caches).
Zeno clash: Street fighter: beat the game without using weapons (fists only) Unless it is absolutely necessary.

I have quit smoking

All killing floor achievements

Any of the '2% or below players have this' achievements.

I once got laid.

Probably one of the rarer/harder to get Audiosurf achievements. I've never really paid much attention to Steam Achievements :x.

On PS3 it's probably the Catherine 100%/platinum.

Rocksmith: Giant! - Beat 2,000,000 points in the Guitarcade game: Big Swing Baseball
Serious Sam: The Second Encounter: Diverse Fragger - Frag 100 different players.
Shatter: BFF - Score 10,000,000,000 points in Endless Co-op.

I feature those in my profile. If you're too lazy:
Borderlands 2 - Challenge Accepted (completed level 1 of all non-specific challenges with a single character)
The Binding of Isaac - Platinum God
Half-Life 2: Episode One: The One Free Bullet (finish the game firing exactly one bullet)
Half-Life 2: Episode Two: Little Rocket Man (send the garden gnome into space)
Saints Row The Third: You're My Hero! (complete all challenges)