Collect an amout of 1000$ in free roam.
Complete a trail with a 3 star rank
Buy at least 2 planes
Unlock the second world
Buy all planes in the shop
Collect 50 stars in total
Unlock all special trails
Buy 50000$ worth of paint jobs
Complete the last special in The Mill under 54.45 and 3 stars
Complete all specials with 3 stars rank
Collect all planes and skins
Shoot down 12 blimps