Here is the full list of all 13 Finally Free achievements.
Nevermore.
Forever.
Rat's love that stuff!
Boom HEADSHOT!
It's still beating.
You shouldn't pick up random WWII grenades!
Gold in my pocket, curse on my back.
Whisper sweet nothing's in to my ear.
Respect your dark side
You died an unfortunate death!
What does it do?
That's not how it works.
Go ahead.