Here is the full list of all 14 Hinterhalt achievements.
Pass "Chapter1".
Pass "Chapter2"
Pass "Chapter3"
Pass "Chapter4"
Pass "Chapter5"
Pass "Chapter6".
Pass "Chapter7".
Pass "Chapter8".
Pass "Chapter9".
Finish the entire campaign.
Have a quick look at the credits.
Reach wave 5 while playing the zombie mode.
Reach wave 20 while playing the zombie mode.
Be ready to join the battle and start a new game.