Full list of all 145 Across the Obelisk achievements.
The base game contains 129 achievements, and there are 2 DLC packs containing 16 achievements.
Craft 100 cards
Stack 200 Burns charges
Achieve Rank 35 with a Hero
Unlock the pet: Mozzy
Unlock the character: Grukli
Unlock the pet: Slimy
Unlock the pet: Oculy
Unlock the character: Zek
Kill 50 Boss monsters
Unlock the character: Gustav
Unlock the pet: Stormy
Show who is the strongest on the battlefield
Master Madness Level 1
Stack 40 Bless charges
Stack 50 Crack charges
Unlock the pet: Daley
Kill the boss: Rhodogor
Unlock the character: Malukah
Kill the boss: Belphyor
Stack 200 Spark charges
Stack 200 Bleed charges
Unlock the character: Bree
Unlock the character: Wilbur
Unlock the pet: Orby
Kill 500 monsters
Unlock 90 warrior cards
Stack 50 Spark charges
Achieve Rank 20 with a Hero
Upgrade 100 cards
Unlock the character: Nezglekt
Unlock the pet: Champy
Kill the boss: Ursur
Stack 50 Poison charges
Unlock 90 mage cards
Unlock 90 healer cards
Kill the boss: Minotaur
Stack 50 Fury charges
Play 5 games
Defeat the game
Kill the boss: Lord Hanshek
Deal 400 damage with a single hit
Unlock 90 scout cards
Unlock the character: Sylvie
Unlock the character: Cornelius
Kill the boss: Erekhal
Stack 40 Sanctify charges
Stack 40 Thorns charges
Gain 5000 shards
Kill the boss: Elder Dryad
Spend 30 supply on town upgrades
Unlock 60 mage cards
Deal 150 damage with a single hit
Unlock the character: Ottis
Kill 10 Boss monsters
Stack 200 Block charges
Kill 200 monsters
Gain 5000 gold
Kill the boss: Ignidoh
Unlock the character: Heiner
Become the new champion of the arena
Kill the boss: Astarios
Unlock 60 warrior cards
Unlock the pet: Betty
Unlock 60 healer cards
Kill the boss: Faeborg
Stack 50 Bleed charges
Stack 50 Burn charges
Stack 40 Insane charges
Unlock 60 scout cards
Stack 50 Chill charges
Kill the boss: Scorn
Stack 40 Regeneration charges
Unlock the character: Thuls
Kill the boss: Tulah
Craft 5 cards
Buy 5 items
Achieve Rank 5 with a Hero
Unlock 30 healer cards
Deal 50 damage with a single hit
Kill the boss: Yogger
Unlock 30 mage cards
Unlock 30 warrior cards
Unlock 30 scout cards
Upgrade 5 cards
Claim 1 treasure
Play 1 game in cooperative multiplayer
Spend 1 supply on town upgrades
Kill the boss: Ylmer
Kill 20 monsters
Stack 50 Block charges
Repair the altar to its former glory
Discover what cultists throw into the pit
Save the baker's son
Accidentally burns the baker's son
Unlock the pet: Flamy
Unlock the pet: Lianta
Make a bet with the crocomafia and win
Feed the harpies
Fight for the crocomen after visiting their village
Fight for the lizardmen after visiting their village
Spend 250 supply on town upgrades
Buy 50 items
Craft 250 cards
Upgrade 500 cards
Claim 25 treasures
Stack 200 Poison charges
Gain 100000 gold
Gain 100000 shards
Stack 200 Crack charges
Stack 200 Fury charges
Kill the boss: Matriarch
Unlock the pet: Sharpy
Become the master craftsman's apprentice
Sit on the mysterious throne
Unlock the pet: Asmody
Find a new member for the Tsnemo crew
Read what happened in the void
Kill the boss: Graendor
Kill the boss: Fred
Unlock the pet: Chompy
Unlock the pet: Chumpy
Stack 200 Chill charges
Deliver the Rime of the Ancient Mariner
Find the Happy Owl founder's runes
Give the two beggars enough money to take the ship
Have a big feast at the Happy Owl
Kill the boss: Ratone
Kill the boss: DT-800
Unlock the character: Laia
Unlock the character: Navalea
Kill the boss: Sandworm
Kill the boss: Mortis
Survive Basthet's ordeal.
Unlock the pet: Fenny
Unlock the pet: Holy Cuby
Unlock the pet: Dark Cuby
Make a wish to the Djinn
Get the Djinn to corrupt you a ring
Discover the secret chamber under the sands of Ulminin
Summon the three scarabs and let them run free
Fulfill the vision and complete the ancient mural
Play a game at the ancient machine