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