Here is the full list of all 17 Xeodrifter achievements.
Break the Boss's Shield
Manually Stimulate a Sprite
Collect all Health Extenders
Visit 100% of Map
Finish the Game
Collect Health During a Boss Battle
Collect all Gun Extenders
Collect Power-up
Kill an Alien Bat
Find Hidden Health
Finish the Game in Under 1 Hour
Beat Final Boss Without Taking Damage