Here is the full list of all 10 Loopomotive achievements.
Beat a level without going under 70% of max speed.
Crash 100 times.
Beat a level without going above 25% of max speed.
Beat the last level.
Unlock all train skins.
Brake and come to a halt next to a car, and then safely continue
Have a big accident. Fly off the level
Crash 10 times.
Do not touch the controls for a minimum of 15 seconds.
Complete the first level.