Here is the full list of all 77 Tower of Time achievements.
Deal 10000 damage in one combat with Rain of Arrows
Apply weakness to 20 enemies in one combat.
Equip all Relics on one character
Transmute gems 30 times
Win combat with health and mana of every champion under 10%
Kill 5 enemies in one combat with Blades of Justice
Blind 20 enemies in one combat
Craft 30 items
Use Gravity Well 4 times in one combat
Use Blind Rage 2 times in one combat
Win battle with a caged hero
Apply 30 upgrades to items
Cast Fireball 5 times in one combat
Summon Mech 4 times in one combat
Place Exploding Runes 5 times in one combat
Use Teleport 5 times in one combat
Use Dash skill 10 times in one combat
Cast Elemental Barrage 25 times in one combat
Reach the ultimate attribute cap of 40 for any attribute.
Kill 3 enemies in one fight with Headshot
Increase a single skill to a maximum.
Apply 10 enchantments
Learn all 6 skills on a single hero.
Win a fight on level 4 or higher with 2 or less champions
Get Cindros Sword
Unlock Mystic Whisper.
Find all Sleath notes.
Win battle with just one champion
Reach the 25 point attribute cap for any attribute.
Resolve the conflicts between the Water and Earth Servants.
Unlock Blademaster Boron.
Reach level 6 with any hero.
Equip all items for a hero.
Solve the puzzle of the clocks.
Finish battle with full hp of whole party
Defeat Ancient Guard
Unlock Runelord Rakhem.
Upgrade Armory.
Heal hero which has less than 5 HP
Deal 1000 damage with Ent in one combat
Upgrade Mage Tower.
Heal 1000 damage in one fight with Healing Totem
Kill 100 enemies.
Unlock Druid Aeric.
Kill death reaper
Use Teleporter.
Obtain a legendary item.
Kill first enemy
Win battle when whole party has less than 10 HP
Withdraw from battle 100 times.