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