Masks need to stay on till the achievement is complete. You can change masks back and forth to do other things but the mask must be on before the action has landed, and or has been completed.
These masks must be on before they land for the numbers to increase.
Cyborg, 100+spots away from home to landing on village/oasis
Devil, collecting silver from daily quests, NOT open quests
Mummy, any robbers + hero + any bandage
Vampire, kill 20k enemy troops NOT robbers
Hockey, with your hero kill 13 enemy heroes
Miniator, kill 1k robbers + Horn of Natar
Scary Clown, completely destroys a town with celebration running
Groucho glasses, Defend against scouting
Caped Skull, destroy 60 levels of walls and buildings + hero
Sea Monster, free 666 from Gaul traps
All need to be on just before they are completed. Just placing them in the queue won't count till they are finished. It's best to use these on new villages when you can speed-build the fields.
Dryad for wood,
Iron Head Dress for Iron,
Scarecrow for crops,
All need cages + a hero, need to be on before they land. If there are multiple animals in the oasis, the mask will only count for that specific animal but spiders and bats will add to the community's total for both servers.
Werewolf, for 500 wolves,
Hannibal, for 500 spiders,
Medusa, for 500 snakes:
Need to have the mask on before you start the action.
Frankenstein, for 6666 troops in healing tent,
Goblin, selling 250 treasures
Venetian, for 20 celebrations,
Wizard/Witch hat, 10 troop research in Academy
Masterful Surgeon, exact troop capacity in healing tent level
Pumpkinhead, upgrade any 50 troops
Phantom of the Opera, music volume max for 8hrs. + celebration
(still debatable on maxed volume) The time goes on and off when you change the mask for doing someother action.
Flower, defense in WW ? (not available till open)
Hope this helps! 😁😝😎