Here is the full list of all 21 Dumball Rush achievements.
Reach the level 10
Reach the level 25
Reach the level 50
Reach the level 75
Reach the level 100
Play Dumball Rush for the first time !
Combine a Bigball and a Magma powerup
Destroy 100 obstacles with a Bigball powerup
Destroy 100 obstacles with a Magma powerup
Finish a race with 8 players at the last position
Play 50 races
Stay stuck in the igloo
Succeed in entering the church
Score 10 goals in the lobby
Spend 20 minutes in customization menu
Spend 20 minutes in the lobby
Gather 4 players in the sumo arena
Use 50 times the quick chat command
Travel a long distance
Open credits
Win 50 races in multiplayer