Here is the full list of all 52 Gravity Heroes achievements.
Complete the tutorial
Complete the Abandoned Warehouse map
Complete the Seat of Council map
Complete the Colony Map
Complete the Synthetic Factory map
Complete the Lunar Base map
Complete the campaign mode on the hard difficulty
Kill 1000 enemies on the campaign and survivor modes
Kill 2000 enemies on the campaign and survival modes
Kill 1000 ball type enemies
Kill 100 B-Balls
Kill 200 B-Balls
Kill 400 B-Balls
Kill 100 War Beetles
Kill 200 War Beetles
Kill 400 War Beetles
Kill 25 laser towers
Make 100 Bolt Patrols destroy themselves
Kill 10 Worms
Explode yourself 50x in any ball type enemy without dying
Perform Ghost revive 5x in a single match
Revive 3x with the same player using the Ghost
Revive 50x with the Ghost
Get 20 sodas in the Refrigerator
Get 50 soda grenade in the Refrigerator
Stay 60 seconds without touching the floor
Finish a campaign stage without any players taking damage
Throw 50 grenades
Heal 50 times
Finish the campaign mode with 4 players
Finish the campaign mode with more than one player
Shoot 100.000 times
Draw on the versus mode
Win a campaign map in 12 minutes
Win the King Beetle boss
Win the Blind Vigilant boss
Win the Tera Ice and Tera Fire bosses
Win the Patriach boss
Win the Saied boss
Stun 100 enemies with the Ghost
Stun 2 enemies with only one Ghost dash
Win a boss fight without taking any damage
Survive more than 5 minutes on the Survivor mode
Survive more than 15 minutes on the Survivor mode
Survive more than 30 minutes on the Survivor mode
Survive more than 20 minutes on the Survivor mode playing with only one player
Finish 30 Survivor matches
Finish 30 Versus matches
Solve all bosses puzzles
Earn medal A or higher at all stages of a Campaign
Earn medal S at all stages of a Campaign