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