10 robots destroyed in succession.
25 robots destroyed in succession.
50 robots destroyed in succession.
Survive 10 waves on hard difficulty.
Survive 25 waves on hard difficulty.
Survive 50 waves on hard difficulty.
Kill yourself by destroying the cube you're standing on.
Reach the top 10 in the overall leaderboard.
Reach the top 3 in the overall leaderboard.
Reach number 1 spot in the overall leaderboard.