Here is the full list of all 29 Worms W.M.D achievements.
Kill 4 worms in a single turn
Collect a wanted poster
Play a Ranked Match
Complete all the Basic Training levels
Finish a game with a worm on more health than it started with
Complete Navigation Training
Gain a Gold Medal on all Training levels
Kill 500 worms
Complete all Training levels
Complete the Campaign
Craft 30 weapons across all game modes
Craft every weapon in the game
Kill 20 worms with Prod
Reach Sheep Rank
Complete all Challenges
Complete 5 Challenges
Complete 15 Campaign Missions
Get 80 kills in a Tank
Get 80 kills in a Mech
Get 80 kills in a Helicopter
Get 40 kills using a Mounted Gun
Play 50 Online Multiplayer Games
Win an online multiplayer match in Sudden Death
Win 3 online games in a row
Win an Online game with all worms in Buildings
Complete 40 Sub Goals
Complete all the Sub Goals
Unlock all the Customisation Items
Fully customise a team of worms