Here is the full list of all 31 Velocity Ultra achievements.
Discover all the secret areas
Complete the reaction test minigame
Hit boost 100 times in a zone
Get 140,000 points in the credits minigame
Rescue every survivor
Achieve above average XP on every zone
Complete Zone 50
Earn a PERFECT medal on Zone 48
Earn a PERFECT medal on Zone 46
Reach Zone 50
Complete zone 21 without rescuing any survivors
Complete Zone 18 without upgrading weapons
Discover at least one secret area
Destroy 5000 Zetachron ships
Disable four switches in quick succession
Disable three switches in quick succession
Disable two switches in quick succession
Use pulse bombs to gain 50 multikills
Earn a PERFECT medal on Zone 10
Beat the minesweeper minigame
Smash 500 pieces of glass
Destroy 1000 Zetachron ships.
Destroy 500 Zetachron ships
Complete a zone without letting go of boost
Get trapped and killed by the scroll
Earn a PERFECT medal on Zone 50
Complete the Smith's Challenge minigame
Earn a PERFECT medal on all Critical Urgency zones
Earn a PERFECT medal for every zone
Collect every in-game award in Velocity Ultra
Because this player earned it