Here is the full list of all 33 RUINER achievements.
Acquire all outfits
Finish NewGame+
Beat the game without dying
Finish Arena:Colosseum
Score more than 50000 points in Arena:Colosseum
Use dash 9001 times
Die 666 times
Unlock all iChing fortunes
Hit 50 mines with your melee weapon
Destroy all dead Hosts' piles
Kill 75 enemies with a shield ram
Burn 420 enemies with flamethrower
Kill all Angels
Beat the game on Normal Difficulty
Beat the game on Hard Difficulty
Complete CATS quest
Defeat TrafficKing
Do 1003 pushups
Defeat Nerve
Finish Epilogue
Beat the game on Easy Difficulty
Finish Speedrun
Achieve 15 kills combo
Hack 50 enemies
Defeat Sisters
Collect all bounties
Acquire all basic abilities
Reflect 100 bullets with your shield
Destroy Angel core in the air
Kill 3 enemies with a one explosion
Destroy 3 Angel cores in one go
Perform 50 Ruiner kills
Finish Prologue