Here is the full list of all 50 Velocity 2X achievements.
Play 60 different Daily Sprints
Obtain max crystals in 20 different Daily Sprints
Perfect all Dual Core Levels
Perfect all Speed Runs
Complete all Dual Core Levels
Perfect all speed levels
Collect all data packs
Look in every folder in Flight Computer
Complete all speed levels
Trigger a speed pad 4 times in under a second in level CU05
Destroy 6 turrets in level CU04 in under one second
Destroy 16 turrets in 2 seconds in Level DC08
Race through Level DC02 without letting go of boost!
Complete all bonus levels
Unlock all bonus levels (25)
Gain 50 PERFECT medals
Get a PERFECT medal on all Critical Urgency levels
Earn Gold medals on all Critical Urgency levels
Avoid every speed pad in level CU02
Boost all the way through level 3
Boost and sprint all the way through level CU02
Complete level 50
Unlock all abilities
Get 100,000 points in the credits minigame
Teledash through two Vokh at the same time
Gain 25 PERFECT medals
Gain above average XP in half the levels
Hit every speed pad in Level 25
Kill every type of enemy (doesn't incude boss battles)
Unlock a bonus level
Destroy 50 Vokh Guards
Defeat a Vokh
Get stuck in a door
Die by leaving one ship behind
Fly over your first speed pad
Use double the firepower!
Partake in your first Daily Sprint Challenge
Disable three switches within 1 second
Shoot 10,000 pieces of glass
Complete a level without letting go of boost
Collect 10,000 crystals
Shoot 5,000 pieces of glass
Survive the first encounter with General Glaive
Destroy 2500 airborne enemies
Rescue 6,000 Jintinda
Collect 5,000 crystals
Disable two switches within 0.5 seconds of each other
Dock your ship for the first time
Gain your first PERFECT medal
Get squished at the bottom of the screen