The Anniversary Patch: 2.0 Title update for STAY has 8 achievements.
Switch to a different Color
Survive for 5 Minutes in a single Lethal test
Survive for 15 Minutes in a single Lethal test
Complete a Speedrun test in less than 5 Minutes
Complete a Speedrun test in less than 8 Minutes
Complete the Phase 5 on a single Wave test
Complete the Phase 10 on a single Wave test
Unlock all the other achievements