Here is the full list of all 19 Atari Mania achievements.
Clean all dirt patches through the game
Defeat NEOS, the First Anomaly, by lighting him up
Defeat EXPLOSA, the Anomaly of Destruction, by exploding TNTs next to him
Defeat DUPLICIO, the Anomaly of Deceit, by finding the real one
Defeat FOBOS, the Anomaly of Fear, by dropping bombs on his head
Defeat INPUTO, the Anomaly of Will, by resisting his inverted curse
Defeat GLOOMDOOM, the Anomaly of Doom, by using the Zorlon Canon
Defeat RANDOMA, the Anomaly of Chaos, by gouging his unpredictable eyes
Find a way to defeat the Last Anomaly
Play 100 microgame variations at least once
Collect all Game Posters
Collect all Game Manuals from the mouse!
Find the tool: Magnet
Using the arcade machine, defeat all microgames of the first floor without losing a life (can be done from an arcade after defeating a boss)
Using the arcade machine, defeat all microgames of the second floor without losing a life (can be done from an arcade after defeating a boss)
Using the arcade machine, defeat all microgames of the third floor without losing a life (can be done from an arcade after defeating a boss)
Using the arcade machine, defeat all microgames of the fourth floor without losing a life (can be done from an arcade after defeating a boss)
Collect every Game Posters and Manuals in the game
Get every achievement in the game