Here is the full list of all 22 Galaxy Cannon Rider achievements.
Do 3 eagles in one gameplay.
Reach 10 cannons further Forge Fields' goal.
Reach 10 cannons further Lost Jungle's goal.
Reach 10 cannons further Blue Bottom's goal.
Reach level 10 with one character.
Reach 15 cannons further Icerim's goal.
Complete Forge Fields.
Unlock all worlds.
Complete Lost Jungle.
Reach 20 cannons further Sand Village's goal.
Reach 20 cannons further Crazy Circus' goal.
Complete Blue Bottom.
Get 50 item boxes.
Complete Dagger Cliffs.
Complete Icerim.
Complete Sand Village.
Finish a ride using only one rider.
Pass through 20 rings of fire.
Complete Crazy Circus.
Reach Level 10 with 4 characters.
Reach level 10 with 6 characters.
Reach 15 cannons further Dagger Cliffs' goal.