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