Here is the full list of all 15 Constellations: Puzzles in the Sky achievements.
Complete 50 blackholes
Complete Carina
Complete all worlds
Unlock Carina
Complete Draco
Complete all worlds?
Complete Cetus
Complete Scorpius
Complete Ursa Major
Complete Leo
Complete Cygnus
Complete Lupus
Complete Lacerta
Complete Lepus
Complete Ursa Minor