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