Here is the full list of all 17 Astro Planes achievements.
You successfully defended earth
You seen your first blackhole
You survived the dark
Fought hard during the war
Fought through toxic space
You witnessed the pretty sights
Your getting closer to bringing this fight to end
You survived another blackhole
You arrived at an alien planet
You infiltrated an alien bunker
You entered the caves
You invaded the aliens
Completed Astro Planes
Scored 1000
Scored 5000
Scored 10000
Scored 20000