Here is the full list of all 20 Shadow Warrior Classic Redux achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Win 10 Pachinko games
Kill 500 enemies
Collect 50 fortune cookies
Find 70 secret areas
Finish "Twin Dragon" expansion
Finish "Wanton Destruction" expansion
Finish "Code Of Honor" episode
Slice 100 evil ninjas with Katana
Find Monty Python and The Holy Grail reference
Hit 20 enemies with a vehicle
Meet Sailor Moon
Defeat Sumo Demon boss
Defeat Serpent God boss
Finish any level faster than 3D Realms time
Finish "Enter The Wang" episode
Breed the rabbits to exhaustion
Kill 50 enemies
Use the Speed Racer RC car
Watch TV in Seppuku Station
Fire Nuclear Missile