Here is the full list of all 18 YARG achievements.
Laugh.
Die for the first of many, many times.
Reach the first Break Room.
"Everything you want is on the other side of fear."
“Giving up is the only sure way to fail.”
“There is no failure except in no longer trying.”
"Every adversity, every failure, every heartache carries with it the seed of an equal or greater benefit.”
Start Rage Mode for the first time. Good luck!
Fail Rage Mode for the first time.
Beat Rage Mode without losing a single life.
Reach the final levels.
Beat the game in Normal Mode.
Prove your worth as a Real Gamer™ by beating Rage Mode.
Open the level editor and place your first object.