Here is the full list of all 12 Last Group Out achievements.
Kill Ingvar.
Kill Blue.
Reach level 10.
Kill Asbjørn.
Kill Gregor.
Kill Steinar.
Kill Jørgan.
Craft an item with the workbench.
Collect 1,000,000 dollars.
Reach level 20.
Reach level 10 mastery with any weapon.
Have a storage value of 1,000,000 dollars.