Here is the full list of all 17 Robot King Part I: Rebooted and Ready achievements.
Kill your first enemy.
Kill 200 enemies over any number of playthroughs
Kill 400 enemies over any number of playthroughs
Beat the game on Respawn Mode
Beat the game on Pur Mode
Beat the Forest Boss
Beat the Snow Boss
Beat the Water Boss
Beat the Desert Boss
Beat the Final Boss
Collect all the Chests on a single playthrough
Collect 8000 gold over any number of playthroughs
Collect 16000 gold over any number of playthroughs
Beat the game with the Basic Gun
Beat the game without dying
Beat the game without saving
Die 20 times over any number of playthroughs