By meeting arbitrary conditions within the game, you will achieve these achievements.

Achievement	How to unlock
Ain't Nobody Got Time For Lap	Finish one lap with nitro and without crashing.
Air Ace!	Finish every other achievement and become the supreme champion of AiRace Speed!
Amazing Job!	Earn 30 achievements.
Bad Luck	Miss the gold star objective on a less by 0.50 seconds or less.
Better Safe Than Sorry	Brake for fifteen continuous seconds.
Break Like A Boss	Get a gold star after using the break for at least one second.
Bronze Master	Win 12 bronze stars.
Can't Touch This	Finish one level without touching a wall.
Captain	Fly for 5 cumulative hours.
Crash Collector	Crash 500 times.
Crash Maniac	Crash 1,000 times.
Crash Proof	Finish 3 laps of the same level without crashing.
Crush	Restart the same level 30 times.
Experienced Pilot	Fly for a total of one hour.
Finger Stuck on Nitro	Finish one 3-lap level with the nitro on without crashing.
Flight Addict	Fly more than 500 miles (805 kilometers) cumulatively.
Flight Lover	Fly for more than 100 miles (161 kilometers) cumulatively.
Flight Maniac	Fly more than 2,000 miles (3,220 kilometers) cumulatively.
Frigate Bird	Fly 15 seconds with the nitro on without crashing.
Gold Digger	Win 6 gold stars.
Gold is Not Enough	Complete a level 5 seconds faster than the gold objective.
Good Job!	Achieve ten achievements.
Greedy!	Win 12 gold stars.
Haphephobia	Finish 5 levels without touching a wall.
Heart Attack	Have a continous shield warning for 60 seconds.
Hipster	Fly more than 20 seconds in the wrong direction.
Immortal	Finish all non-endless levels without crashing.
Legend	Win every star.
Marathon	Pass 4 stages of any endless level.
Miracle	Have your shield at 5% or less before returning it to 100%.
Nitro Maniac	Finish five different levels with the nitro on without crashing.
Obsession	Complete the same level ten times.
Peregrine Falcon	Fly 120 seconds with nitro on without crashing.
Risky Business	Get a continuous shield warning across 15 seconds.
Serial Crasher	Crash 100 times.
Silver Master	Win 15 silver stars.
So Close...	Crash after completing more than 99% but less than 100% of a level.
Super Captain	Fly more than 10 cumulative hours.
The Neverending Story	Pass 12 stages on an endless level.
Tough	Finish one lap without crashing.
Ultramarathon	Finish 8 stages of an endless level.
Unbreakable	Finish 5 non-endless levels without crashing.