Here is the full list of all 12 CM-SS13 achievements.
The base game contains 0 achievements, and there is 1 DLC pack containing 12 achievements.
Enter into this world violently.
A violent triumph, or a miserable failure?
Here's your rifle and helmet, boot.
Gotta keep moving.
Our most typical group of marines.
The most diligent of architects and engineers.
The purple squad of friendly faces.
Relentless and bloodthirsty, the head of the charge.
Don't forget to close their incisions.
Pick up that can.
That was a close one.
Always go rock.