Here is the full list of all 32 Speed Limit achievements.
Enter the most famous cheat code
Enjoy the elevator music for 10 minutes
Complete normal mode
Fall through both plane wing holes
Complete Stage 10 on normal mode
Destroy the final boss' paint job
Complete Stage 9 on normal mode
Kill 5 enemies on Stage 9
Complete Stage 8 on normal mode
Complete Stage 7 on normal mode
Complete Stage 6 on normal mode
Land into water and drown
Complete Stage 5 on normal mode
Complete Stage 4 on normal mode
Complete Stage 3 on normal mode
Don't kill the bazooka guy
Complete Stage 2 on normal mode
Complete Stage 1 on normal mode
Don't miss a shot on Stage 1
Kill 100 conga line guys without dying
He just doesn't care
Shoot your future self
Shoot your past self
Don't stop accelerating while on a bike
Fail to enter the choppa
Take no damage when driving choppa
Fire exactly one missile from choppa
Complete Stage 10 by only moving left
Survive 5 impacts with plane debris
Complete easy mode
Complete normal mode under 30:00
Complete 2 loops in infinite mode