Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Astronaut Training: Bronze	Spend more than 60 seconds above engine ceiling.
Astronaut Training: Gold	Spend more than 600 seconds above engine ceiling.
Astronaut Training: Silver	Spend more than 180 seconds above engine ceiling.
Ballistic	Fly above 1400 M.
Bomber Ace: Bronze	Kill 3 bombers.
Bomber Ace: Gold	Kill 50 bombers.
Bomber Ace: Silver	Kill 10 bombers.
Captain Stubing	Cruise 30 km on the deck of your carrier.
Combat Glider: Bronze	Kill 1 enemy while above engine ceiling.
Combat Glider: Gold	Kill 10 enemies while above engine ceiling.
Combat Glider: Silver	Kill 3 enemies while above engine ceiling.
Crash Dive	Unknown.
Cruise Director	Cruise 10 km on the deck of your carrier.
Eco-Warrior	Finish a level with less than 5% of terrain infected.
Fighter Ace: Bronze	Kill 3 fighters.
Fighter Ace: Gold	Kill 50 fighters.
Fighter Ace: Silver	Kill 10 fighters.
Frequent Flyer: Emerald Status	Fly 30 km.
Frequent Flyer: Ruby Status	Fly 300 km.
Frequent Flyer: Sapphire Status	Fly 150 km.
Frequent Shopper	Buy every upgrade for your aircraft.
Half a Wing and a Prayer	Unknown.
Kamikaze: Bronze	Kill an enemy by colliding with it.
Kamikaze: Gold	Kill 10 enemies by colliding with them.
Kamikaze: Silver	Kill 3 enemies by colliding with them.
Make Love Boat Not War Boat	Cruise 3 km on the deck of your carrier.
Missile Commander: Bronze	Score 3 missile kills.
Missile Commander: Gold	Score 50 missile kills.
Missile Commander: Silver	Score 10 missile kills.
Moon-Shot	Fly above 1800 M.
Running on Empty	Unknown.
Sniper	Kill an enemy from 1600 m with your guns.
Sub-orbital	Fly above 1600 M.
The Avenger	Unknown.
Turtle Drive-by: Bronze	Kill an enemy while parked on carrier deck.
Turtle Drive-by: Gold	Kill 5 enemies from carrier deck in a single level.
Turtle Drive-by: Silver	Kill 3 enemies from carrier deck in a single level.