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