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