1. Select : single player > Slaughter Hause (set everything to lowest) > Play





2. At start get the M16 using E





3. Go to a ranom portal and press E again

4. At the start of the level open the map with TAB and wait for the animal to spawn, when you see go to it and kill it with the M16

You will get teleported to the next level, repeat other 3 times (for a total of 4) and you will have completed all the achievements

Hold shift to run
Spam spacebar to fly