Here is the full list of all 8 WW2 Rebuilder: Germany Prologue achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Find all secrets
Complete the level with five stars
Put the bell on the tower
Eat an apple
Decorate the city
Build up a pulpit
Put bricks on a boat and transport them to the other side.
Clean up destroyed building with buldozer