Here is the full list of all 25 Red Ronin achievements.
Start to walk normally
Don't let Chatty Escape
Perform a 4x combo
Hide from sniper triggering the cover animation
Die 10 times in the same room
Die 20 times in the same room
Let Chatty escape
Beat the game without dying
Defeat the Second Boss
Defeat the Third Boss
Defeat the Fourth Boss
Spend 1 minute without moving.
Block a hit from the enemy
Perform a 8x combo
Perform a 16x combo or higher
Activate the bot 10 times in the same room
Finish the arena room
Spend 1 minute in Tactic Mode
Finish the Game
Read all of the targets files.
Complete the First Memory Unit
Complete the second Memory Unit
Complete the third Memory Unit
Complete the fourth Memory Unit
Finish the game in 1 hour or less