Here is the full list of all 25 GB Rober achievements.
Finish a stage with 1hp and without dying once
Earn 15 Coins for yourself within a single work shift.
Earn your boss 100 Coins total.
Earn your boss 1000 Coins total.
Earn your boss 1 Million Coins total.
Finish the game without ever standing still for too long.
Finish a stage without ever standing still for too long
Finish a Stage without ever walking(!) to your right.
Play the game with one of the provided assist options
Finish the Game in Tourism Mode
Finish the Game without ever using Hyper Mode
Find all the hidden Trinkets in the game (I swear they will be useful in the future!)
Free all of your Friends!
Destroy Vintage Prospective
Destroy Stave Eminence
Destroy Retro Schwan
Destroy Cadence Exaltation
Destroy Dr. Boss
Defeat PD Rober
Finish the Game in under 25 Minutes
Finish the game without ever using a special weapon
Finish the Game without ever taking damage
Finish a Stage without ever taking damage
Finish the Game in under an Hour
Finish the Game in under 35 Minutes