Complete the indicated task to unlock the achievement.

Achievement	How to unlock
...I still don't understand why it happens!	Unknown.
Bullet hell	In the Adventure mode, reach the hightest possible firerate and use bouncing ammo.
Cyber Pool Veteran	Hit the enemy with ricochet shot 50 times.
Fireworks show	Shoot while four or more ammo types are active.
Gambling Einstein	Use the quantum dice.
Keep them coming!	Enter the Infinite mode.
Let me in. LET ME IIIIIIIIIIIN!	Unknown.
Overachiever	Defeat the Admiral 3 times.
Stacked	Reach the Admiral with six artifacts collected.
Time Paradox	While "Chaotic Artifacts" modifier is active, posses two artifact perks, that normally are mutually exclusive.
Weird flex	Reach the Admiral without any artifacts.
You've got a friend in me	Revive your friend in co-op mode.