Here is the full list of all 41 Automatrons - there are Tower Defense achievements.
Win one round
Spend 50,000 scraps.
Use 1,000 in energy
Play the game for one hour
Win 5 rounds
Win 10 rounds
Win 15 rounds
Win 20 rounds
Play the game for five hour
Play the game for ten hours
Play the game for fifteen hour
Play the game for twenty hour
Win this level on a easy difficulty
Win this level on a normal difficulty
Destroy 1,000 units
Destroy 5,000 units
Destroy 10,000 units
Destroy 15,000 units
Destroy 20,000 units
Get level 5
Get level 10
Get level 15
Start the next wave before the timer run out