Reach the 13th wave.
Reach the 10th wave.
Reach the 7th wave.
Increase the crew to five.
Reach the 5th wave.
Kill two or more enemies at once with a single laser shot.
Reach the 12th wave.
Kill 50 of them with the increased damage of the bullets.
Reach the 9th wave.
Reach the 6th wave.
Increase the crew to two.
Lose your first game.
Shoot 200 bullets while the rate of fire is increased.
Shoot 100 bullets while the rate of fire is increased.
Reach the 3rd wave.
Gain a skill for the first time.
Clear your first wave.
Defeat an enemy for the first time.
Reach the 19th wave.
Reach the 18th wave.
Reach the 16th wave.
Reach the 17th wave.
Reach the 14th wave.
Endure 3 waves with 1 piece of baumkuchen remaining.
Reach the 20th wave.
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