Here is the full list of all 13 Peku - there are Space Dragon achievements.
Play with Peku's normal skin
Play with Peku's ice skin
Start up the game for the first time!
Eat your first planet
Score 1000 points
Score 5000 points
Score 10000 points
Score 15000 points
Reach level 2
Reach level 5
Reach level 10
Die from a laser blast
Die from a laser barrier