Here is the full list of all 26 Chenso Club achievements.
You finished the tutorial!
Defeat 100 enemies.
Defeated the evil in the castle.
Defeated ProtoBlue.
Gain 1000 followers on chirp!
Reached difficulty stage 5.
Dash 200 times!
Have 5 friendly drones simultaneously.
Have 10 shields protecting you at once!
Unlock all playable characters.
Complete 25 quests!
Complete 40 events!
Defeat 1000 enemies!
Defeated death itself.
Avoided the angry mammoth!
Unlock all friendly followers.
Reached difficulty stage 8.
Gain 10000 followers on chirp!
Have a total health of 100!
Defeat big brain Brian.
Defeat 20 bosses!
Defeat sigma Wilhelm!
Unlock all items and powerups.
Gain 100000 followers on chirp!
Reached difficulty stage 14.
Finish the game with all characters!