Here is the full list of all 29 Crawlers and Brawlers achievements.
Equip an Artifact item.
Level up any character to 10.
Level up any character to 20.
Level up any character to 30.
Complete the story mode.
Defeat the Orc King boss fight.
Defeat the Fire Mage boss fight.
Defeat the Mine Manager boss fight.
Defeat the Curator boss fight.
Defeat the Lord Wellington boss fight.
Equip an epic item.
Defeat 10 players in Brawl games.
Defeat 50 players in Brawl games.
Defeat 100 players in Brawl games.
Defeat 500 players in Brawl games.
Defeat 1000 players in Brawl games.
Loot 1,000 gold from Crawl/Story games.
Loot 10,000 gold from Crawl/Story games.
Loot 100,000 gold from Crawl/Story games.
Loot 1,000,000 gold from Crawl/Story games.
Level up a wizard character to 30.
Level up a warrior character to 30.
Level up a cleric character to 30.
Buy 10 conjuring potions.
Buy 50 conjuring potions.
Buy 100 conjuring potions.
Buy 1,000 conjuring potions.
Complete the Halloween candy quest.
Level any character to 40.