Here is the full list of all 43 WET achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Earn a Gold Medal in every Challenge (Boneyard Challenges).
Get a balance of 50,000 Style Points (Story Mode).
Beat the target score in every Chapter (Points Count Mode).
Kill a total of 200 Enemies using Rubi's Dart Bows during acrobatic slow-mo.
Earn a Silver Medal in every Challenge (Boneyard Challenges).
Earn a Bronze Medal in every Challenge (Boneyard Challenges).
Finish Story Mode on Femme Fatale (Ultra Hard) difficulty.
Purchase all Upgrades.
Beat the target score in any 3 Chapters (Points Count Mode).
Finish Story Mode on Fixer (Hard) difficulty.
Finish Story Mode on Hired Gun (Normal) difficulty.
Purchase all Rubi Weapon Upgrades.
Finish Story Mode on Golden Bullets difficulty.
Kill a total of 100 Enemies while using stationary gun.
Kill a total of 200 Enemies using Rubi's Shotguns during acrobatic slow-mo.
Kill a total of 200 Enemies using Rubi's Sub-Machineguns during acrobatic slow-mo.
Collect every Monkey Toy in the game.
Kill every Scorpion in Rubi's Boneyard.
Purchase all Rubi Ability Upgrades.
Kill 200 Enemies with acrobatic Sword attacks.
Kill a total of 100 Enemies at maximum multiplier (x5).
Beat the target score in any Chapter (Points Count Mode).
Finish Story Mode on Cake Walk (Easy) difficulty.
Complete Chapter 12 on any difficulty setting (Story Mode).
Complete Chapter 11 on any difficulty setting (Story Mode).
Complete Chapter 10 on any difficulty setting (Story Mode).
Reach a chain kill count of 60 while in Rage Mode.
Kill 30 Enemies with environmental objects or explodables.
Complete Chapter 9 on any difficulty setting (Story Mode).
Kill 100 Enemies with headshots.
Complete Chapter 8 on any difficulty setting (Story Mode).
Complete Chapter 7 on any difficulty setting (Story Mode).
Complete Chapter 6 on any difficulty setting (Story Mode).
Complete Chapter 5 on any difficulty setting (Story Mode).
Kill a total of 200 Enemies using Rubi's Pistols during acrobatic slow-mo.
Complete Chapter 4 on any difficulty setting (Story Mode).
Kill 3 Enemies at the same time.
Complete Chapter 3 on any difficulty setting (Story Mode).
Complete Chapter 2 on any difficulty setting (Story Mode).
Complete Chapter 1 on any difficulty setting (Story Mode).
Purchase any 3 upgrades.
Collect every Monkey Toy in a single Chapter.
Collect 1 Monkey Toy.