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