No missable achievements (plus 20 unknown)
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Kill 50 enemies
Use the Speed Racer RC car
Watch TV in Seppuku Station
Fire Nuclear Missile
Kill 500 enemies
Finish "Enter The Wang" episode
Defeat Serpent God boss
Slice 100 evil ninjas with Katana
Defeat Sumo Demon boss
Find Monty Python and The Holy Grail reference
Breed the rabbits to exhaustion
Collect 50 fortune cookies
Win 10 Pachinko games
Finish "Code Of Honor" episode
Finish any level faster than 3D Realms time
Find 70 secret areas
Hit 20 enemies with a vehicle
Finish "Wanton Destruction" expansion
Meet Sailor Moon
Finish "Twin Dragon" expansion