Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Door Ajar	Claim your first Key.
Balance Restored	Win a Center finale.
Clean Sector	Earn three stars on all five stages of a sector.
Cube Cracked	Claim the Key of the Voxel universe.
Every Center Differs	Win the Center finale with every combination of three universes.
First Shift	Start your first run.
Flawless World	Earn all 45 stars in one universe.
Four Doors	Collect all four Keys in one campaign.
Gold Standard	Earn three stars on a stage.
Heating Up	Claim a Key at Danger 2 or higher.
It Smiled Back	Find what the crystals were hiding.
Maximum Danger	Claim a Key at Danger 5.
One Breath	Win a Center finale without buying an extra life.
Orbit Silenced	Claim the Key of the Alien universe.
Overflow Contained	Claim the Key of the Number universe.
Pixel Purge	Claim the Key of the Retro universe.
Six Layers	Fill all six weapon slots in a run.
Star Collector	Earn 100 stars in total.
Star Key	Earn 21 stars before a universe's final boss.
The Center Opens	Collect three Keys in one campaign.