Here is the full list of all 15 Demolition Engineer achievements.
Earn 500 coins
Complete the game
Complete level 5
Complete level 4
Destroy 30 buildings
Complete level 3
Repaint the machine
Complete level 2
Earn 100 coins
Complete level 1
Destroy your first building
Destroy 100 buildings
Earn 1000 coins
Unlock all styles of painting
Upgrade all stats to the max