[Mission 1]
In Dryfield after the water tower episode you can use nothing but the tonfa baton against enemies and only use one healing item until cannon mouth (the flamethrower guy) when you can use only the PO8 and 2 healths. After that continue the game as normal.

[Mission 2]
Try to fake the enemies as many times as you can without attacking
them. (faking= when you see an enemy, go into battle then run towards them and then at the last minute dodge) mark down on a piece of paper 1 point for every time you fake one!

[Mission 3]
Go through Akropolis tower using no health what-so-ever and kill all enemies with the M93R. Continue the game as normal afterwards.

[Mission 4]
Avoid attacking golems when they are paired up by taking advantage of
shooting ones and making them shoot their friends!

[Mission 5]
Buy only one weapon from each person who sells them and finish the game with the M249.