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