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