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