Here is the full list of all 18 Occultus Command achievements.
You finished the tutorial
You unlocked the fire weapon
Defeat the first boss
Upgrade your character with the upgrade Item
Defeat the second boss
Acid was the solution…
The game of chess is like a sword fight…
...made weapons for us all...
Beat the game with speed
The hard way..
Beat the game after time runs out
Max out all three levels
Do serious damage to Crab Tank
Beat the game and use less than two health trade items
Die more than 20 times
Defeat the Geyser upgrade boss
Destroy robo dogs.