Here is the full list of all 20 Globat Pixels achievements.
Kill 3 enemies with one shot
Change weapons 12 times in one game
Change weapons 12 times in one life
Kill 5 enemies in one life with the bouncer
Win against AI with maximum difficulty level whilst only using the bouncer
Kill 7 enemies in one life with the homing bullet
Die 15 times in one game and still win the game
Score the last point whilst playing with an ally
Kill 3 enemies in one life with the particle ray
Kill 5 enemies in one life
Play the Eiffel tower map
Win against AI with maximum difficulty level
Play the Taj Mahal map
Kill an enemy with the homing bullet
Use 4 weapons in one game
Kill 2 enemies with one shot
Kill an enemy with the shotgun
Survive 40 seconds without shooting
Kill an enemy with the bouncer
Kill an enemy with the particle ray