Here is the full list of all 80 Runestone Keeper achievements.
Complete with Merlin on any difficulty
Reach floor 30 in Endless mode
Complete with Hogg
Complete with Svafa
Win against Ancient Memories
Clear all arenas throughout the entire game in Normal mode
Kill 200 monsters in one go
Kill an elite monster while stacked with 15 weakness effect
Kill an elite monster while stacked with 20 cursed effect
Simultaneously sustain erosion, curse, toxin and weakness effect
Collect 1000 coin in one game journey
Kill 15 elite monsters in one go
Hero reach level 10
Unlock Hogg
Unlock Svafa
Forge a runestone
Kill all the wizards in a Wizard dungeon
Find and clear an arena
Killed by a monster explosion
Reach one full upgrade
Complete with Guy
Win against Nightmare Fiend
Reach floor 20 without believing in any Gods
Kill a Screen Block monster
Kill an Overlord monster
Be really vital
Killed by a spike trap
Die on 1st floor
Die in an arena
Single strike cause more than 100 damage
All attributes tuned to 5
Kill a ranged elite monster
Get through a dungeon without killing anything
Use an altar
Collect your first piece of runestone
Believe in the God of War
Betray a God
Obtain a piece of rare equipment
It is your day.
Believe in the Guardian of Rock
Believe in a God
Believe in the Goddess of Magic
Who's this little fella?
And much more to be spilled!
Killed by a poison trap
Light the torch in the tutorial
Hero reach level 12
Betray two Gods in a row
Having 9 tattoos!
Soul point reach 80
Believe in the Holy Contractor
Believe in the God of Vengeance
Believe in the God of Treasure
Believe in the Goddess of Benevolence
Believe in the God of Devastation
Believe in the God of Evil
Ahhhhhhhhhhhhhhhhhhh
Kill an elite monster while stacked with 40 erosive effect
Be really vigorous
Reach all full upgrades
Reach floor 21 in Abyss mode
How dare you...traitor!
Killed by an Overlord monster
Die from the Lich quest
Try heads next time.
Killed by a bomb
Interchange life percentage with a monster
Complete with Alexander on any difficulty
Complete with Azir on any difficulty
Activate "Lucky" Runeword and complete on any difficulty
Activate "Conqueror" Runeword and complete on any difficulty
Activate "Tyrant" Runeword and complete on any difficulty
Activate "Pagan" Runeword and complete on any difficulty
Activate "Spell Breaker" Runeword and complete on any difficulty
Activate "Fresh Blood" Runeword and complete on any difficulty
Complete with Balerio on any difficulty
Complete with Lilith on any difficulty
Complete with Morte on any difficulty
Complete with Dellamorey on any difficulty