Here is the full list of all 63 Warlords Under Siege achievements.
Buy First Card Pack
Kill 500 enemies during one run
Beat the Western Valley
Beat Passage of the Dead
Kill 1500 enemies during one run
Kill 2500 enemies during one run
Kill 500 enemies with Hero, during one run
Gather 5000 iron during one run
Gather 30000 stone during one run
Gather 60000 wood during one run
Kill 10000 enemies in total
Kill 50000 enemies in total
Kill 100000 enemies in total
Beat the Shaman
Beat the Chieftain
Beat the Giant
Beat the Dark Mage
Beat the Great Summoner
Beat the Wild Hunt
Get all Town Hall Upgrades
Upgrade Town Hall to level 3
Upgrade Town Hall to level 5
Recruit 10000 soldiers in total
Gather 10000 gold from Gold Mines
Gather 5000 Gold from Caravanas
Take 50000 damage with a Hero during one run
Deal 50000 damage with a Hero during one run
Buy 10 Card Packs
Buy 50 Card Packs
Resurrect The Hero
Beat Nightmare I of the Western Valley
Beat Nightmare II of the Western Valley
Beat Nightmare III of the Western Valley
Beat Nightmare IV of the Western Valley
Beat Nightmare V of the Western Valley
Beat Nightmare I of the Passage of the Dead
Beat Nightmare II of the Passage of the Dead
Beat Nightmare III of the Passage of the Dead
Beat Nightmare IV of the Passage of the Dead
Beat Nightmare V of the Passage of the Dead
Beat Nightmare I of the Iron Mountains Keep
Beat Nightmare II of the Iron Mountains Keep
Beat Nightmare III of the Iron Mountains Keep
Beat Nightmare IV of the Iron Mountains Keep
Beat Nightmare V of the Iron Mountains Keep
Beat the Iron Mountains Keep
Beat the Oasis of the Lost
Beat the Hill of Sorrow
Beat Nightmare I of the Oasis of the Lost
Beat Nightmare II of the Oasis of the Lost
Beat Nightmare III of the Oasis of the Lost
Beat Nightmare IV of the Oasis of the Lost
Beat Nightmare V of the Oasis of the Lost
Beat Nightmare I of the Hill of Sorrow
Beat Nightmare II of the Hill of Sorrow
Beat Nightmare III of the Hill of Sorrow
Beat Nightmare IV of the Hill of Sorrow
Beat Nightmare V of the Hill of Sorrow
Survive 30 minutes, on Western Valley, on Endless mode with Chaos mode enabled
Survive 30 minutes, on Passage of the Dead, on Endless mode with Chaos mode enabled
Survive 30 minutes, on Iron Mountains Keep, on Endless mode with Chaos mode enabled
Survive 30 minutes, on Oasis of the Lost, on Endless mode with Chaos mode enabled
Survive 30 minutes, on Hill of Sorrow, on Endless mode with Chaos mode enabled