WET
43 Achievements
1,000
15-20h
Hard Time
Finish Story Mode on Fixer (Hard) difficulty.
50
How to unlock the Hard Time achievement in WET - Definitive Guide
Upgrade your health first and then choose the other upgrades carefully.
It is recommended that you play on this difficulty for your first play-through. The game can be pretty frustrating at times but once you get a hold of the game-play mechanics and figure out the enemies patterns, it will become easier. While you shouldn't need it, here is a link to a youtube walkthrough: WET Walkthrough. (I didn't use this guide, so I can’t vouch for its quality).
Difficulty achievements do stack.
You will need to play through the game at least once to unlock the "Ultra Hard" and "Golden Bullets" difficulties. This shouldn't be to difficult but if you are having issues just practice and keep at it like any other hard mode.
I suggest you make good use of the upgrades and upgrade your health as soon as possible.
See "Blood, Sweat and Tears"
I would also like to note that if you don’t want to target a hardcore game, then take the easier difficulty...