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