Here is the full list of all 18 SEX with HITLER: WW2 achievements.
Kill 20 enemies
Start the game without purchasing
Complete second level
Complete fourth level
Complete sixth level
Complete seventh level
Kill 50 enemies
Kill 150 enemies
Kill 250 enemies
Kill 400 enemies
Unlock all weapons
Unlock all perks
Use a grenade
Use the grenade 10 times
Use the grenade 25 times
To die for the first time
Pick up the first aid kit 10 times
Pick up ammo 10 times