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