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