Here is the full list of all 12 Alien Egg: Ascent achievements.
Reach the Surface
Escape the Glassware
Escape the Incubator
Reach Outer Space
Slip Past the Ice
Ascend Past the Alien Spikes
Complete the Game
Complete the Game in Under 3 Hours
Complete the Game in Under 1 Hour
Complete the Game in Under 30 Minutes
Fall Fast Enough to Burn Up In the Atmosphere
Get Past the Vanishing Nebulas