Defeat 50 enemies
Acquire 10 upgrades in total
Defeat 500 enemies,
Reach level 15
Acquire a total of 20 upgrades
Upgrade 3 items to the maximum level.
Survive 50 levels
Defeat 250 enemies
Reach Level 5
Reach Level 10
Acquire 5 different upgrades
Max out an upgrade
Defeat Boss 1
Defeat Boss 2
Survive 20 waves
Defeat 500 enemies
Reach Nivel 15
Survive 50 waves
