Here is the full list of all 15 SUFFER 2 achievements.
Complete a great game
Complete SUFFER 2 on Hard mode
Complete SUFFER 2 on Brutal mode
Collect the hidden Anarchy in every level
Beat the training level
Complete Chapter 1
Complete Chapter 2
Complete Chapter 3
Complete all levels under par time
Get 100% kills on all levels
Complete 25 levels with Flawless Victory
Show The Leviathan your middle finger!
Show Judgement Day your middle finger!
Show the Screen of Death your middle finger!
You are the ultimate SUFFER player!