Here is the full list of all 21 Planet Lander achievements.
Complete stage 21
Complete stage 20
Complete stage 19
Complete stage 18
Complete stage 17
Complete stage 16
Complete stage 15
Complete stage 14
Complete stage 13
Complete stage 12
Complete stage 11
Complete stage 10
Complete stage 9
Complete stage 8
Complete stage 7
Complete stage 6
Complete stage 5
Complete stage 4
Complete stage 3
Complete stage 2
Complete stage 1