Here is the full list of all 11 Ynglet achievements.
The base game contains 10 achievements, and there is 1 DLC pack containing 1 achievements.
Complete Botanisk Have
Complete Valby
Complete Christiania
Complete Sydhavnen
Complete Vesterbro
Complete Kastrup
Complete Tårnby
Complete Nørrebroparken
Collect all stars and watch the ending
OneZeroOne.pdf
Play through the bonus world