Here is the full list of all 24 Burnstar achievements.
Gold all three stats in one level.
Unlock a Secret Level in the game.
Beat the boss level in Forest.
Beat the boss level in Mines.
Beat the boss level in Labs.
Beat the end boss level and win the game!
Unlock and complete all the secret levels.
Find and collect one sapling in any level.
Find and collect all the saplings in Forest.
Find and collect all the saplings in Mines
Find and collect all the saplings in Labs
Find and collect all the saplings in the game.
Gold all the levels in Forest.
Gold all the levels in Mines.
Gold all the levels in Labs.
Gold all of the Secret Levels.
Gold all levels in the game.
Uncover a Starbot in a level.
Uncover five Starbot's in the game.
Uncover ten Starbot's in the game.
Uncover fifteen Starbot's in the game.
Beat the boss level in the first bonus world.
Gold all the levels in the first bonus world.
Gold all of the secret levels in the first bonus world.