Here is the full list of all 79 Scarlet Tower achievements.
Beat the Scarlet Tower in Corruption 10
Win 5 matches using only magic weapons.
Collect 20 Re-roll dice in a single run
Defeat 1000 Pink Jellyfish in Leviathan's Lair
Help the Engineer
Collect 5 Equipment Banish in a single run
Survive 1 full day in Endless Mode
Defeat Vorax
Defeat Vorgron
Beat Corruption 10 with the Knife of Darkness in your Arsenal
Defeat 1000 Brains in the Plaguelands
Defeat more than 100,000 enemies
Collect 100 pieces of food
In Endless Mode, make it until nightfall without taking damage
Buy something exclusive to Infinite Mode from the Seller
Complete the Necromancer Quest
Complete the Templar Quest
Complete the Alchemist Mission
Complete the Bloodmancer Quest
Complete the Priest Quest
Complete the Blacksmith Quest
Complete the Elementalist Quest
Complete the Paladin Quest
Slain World Eater on Corruption 10 Leviathan's Lair.
Win the Plaguelands Map in Corruption 9 with Rhys.
Win the Plaguelands Map in Corruption 9 with Lyah.
Win the Plaguelands Map in Corruption 9 with Ninn.
Win the Plaguelands Map in Corruption 9 with Vylat.
Win the Plaguelands Map in Corruption 9 with the Jinn Familiar.
Slain World Eater on Corruption 10 Plaguelands.
Win the Plaguelands Map in Corruption 9 with Lance.
Win the Plaguelands Map in Corruption 9 with the Hoot Familiar.
Slain World Eater on Corruption 10 Nightpine Valley.
Win the Plaguelands Map in Corruption 9 with Allure.
Win the Plaguelands Map in Corruption 9 with the Undine Familiar.
Win a match without taking damage.
Beat Corruption 3 Without Take any Damage.
Win the Plaguelands Map in Corruption 9 with Veromus.
Win the Plaguelands Map in Corruption 9 with the Salamander Familiar.
Collect 1000 blood gems.
Defeat 30 Silver Werewolf
Beat Corruption 9 before 22 minutes.
Slain Octopus on the Ocean.
Slain Angler Fish on Ocean.
Create 10 different weapon fusions.
Defeat Krampus
Buy the 12 different flasks from the secret seller.
Buy 30 flasks from the secret vendor.
Slain Flesh Demon on Plagulands.
Search for the lost egg in the world.
Defeat 100 Carnivorous Plants
Defeat Puker 5x at Night Time.
Defeat 500 Tentacles
Defeat Death at Corruption Level 1 or higher
Survive for 24 minutes.
Survive for 24 minutes at Woods of Havoc.
Upgrade Glacial Staff to Rank V
Defeat 800 Snowman
Upgrade Frost Staff to Rank V
Defeat 5.000 Enemies at Night Time.
Find someone lost in the woods at nighttime.
Defeat Puker at Night Time
Defeat 500 Slimes
Defeat 1000 Ghost Witches
Upgrade Holy Bible to Rank V.
Upgrade Thunder Staff to Rank V.
Defeat 100 Goblins
Survive for 12 minutes.
Survive for 15 minutes.
Defeat 300 Ghost Witches
Upgrade Fire Staff to Rank V.
Defeat 300 Red Bees at daytime.
Defeat 30 Slimes
Defeat 100 Zombies
Survive for 2 minutes.
Survive for 5 minutes.