Here is the full list of all 14 Worms Clan Wars achievements.
Kill a total of 300 enemy worms
Kill a total of 100 enemy worms
Complete "Meat In The Middle"
Win a ranked Clan Match
Complete a multiplayer match using your personally created landscape
Kill a total of 10 enemy worms
Complete "The Mission Before Time"
Create your own clan, complete with emblem
Fully customise your worms
Complete "Worm On Trap"
Complete "The Class Act"
Complete "Fugu Fountain"
Defeat the evil Lord Mesmer
Complete all Worm Ops missions