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