Puzzle Sun-Stone Piece Locatio...
	Various Steam Achievements...

Puzzle Sun-Stone Piece 1: Solve a candles puzzle on the left side of that room. In the center platform you will find a first fragment.
Puzzle Sun-Stone Piece 2: Taimurian Camp, you should solve a Totems/Statues puzzle and after that you will find here (where Zaar stand on picture) a piece of stone.
Puzzle Sun-Stone Piece 3: Dura'Tyr room, check the picture and a map there to find in which room exactly.
Puzzle Sun-Stone Piece 4: Placed in Ziggurat of the Sun, just change a mirror near the teleporter on that hole and you will get it.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Angel	Purify your form; perfection is your playground.
Arachnophobia	Defeat the Aphotic Spider Queen and her minions.
Beguile the Serpent Wyrm	Avoid fighting Graabak.
Believer? Or Sucker?	Throw 999 silver into the well in the House Cellar.
Catch This!	Defeat the Scorpion King.
Darius and Falon	Unlock Darius and Falon.
Demise of the Demontamer	Defeat Aknush.
Devil	Revel in the gloom; sate those base desires!
Devourer of Puppets	Unlock 8 Puppets in one playthrough.
Dracon Tamer	Unlock Draconian.
Espionage	Successfully infiltrate the Penta Nera's convocation.
First Day	Earn second level.
Git gud!	Lose 100 Puppets. Lose, or misplace?
Glorious Erudition	Learn all about the Heretic Kingdoms by reading every book.
Got Gud	Complete the game on at least Hard difficulty with no puppet deaths. Because reasons.
Harmony in Parsimony	Have 300,000 gold available to spend.
I Command Thee!	Unlock the Ishkai Sniper soul.
Insecticide	Kill 1,000 vermin-type enemies.
Liberate Corwenth	Have Darius liberate all of Corwenth from the demon invasion.
Mastered	Reach level 30 with any Puppet.
Nobody expected this...	Equip a character with a full set of the legendary Inquisition armor.
Novice	Reach level 10 with any Puppet.
Oldschool	Complete Both Books in Oldschool Mode.
Raid the Imperial Tombs	Learn the secret of Evia's death.
Rat Plague	Cleanse the world of 100 rats.
Realm of Indecision	Switch between Shadow and Mortal Realm 10,000 times. Did you forget something?
Regain the Guild	Return Kalig to the head of the Guild of Steel with at least one of the mercenaries surviving.
Relics of the Fallen	Activate All Cenotaphs.
Restore House Malfagon	Have an old friend rescue House Malfagon from its enemies - and it's own ambition.
Skilled	Reach level 20 with any Puppet.
Specialist	Max out one of your Skills with any Puppet.
Sympathy for the Sura	Talk to Korshak having slain no-one that Falon knows.
The End?	Complete Book Two.
The Eye of Worlds	Witness all three main endings.
The Great Escape	Successfully escape Thole.
The Heretic Kingdoms	Complete the game on Extreme difficulty.
The Last Greyclaw's Staff	Recover the Shaman's Staff.
The Lord of Suffering	Acquire the Reaper sword.
To be continued...	Complete Book One.
Unstoppable	Destroy 1,000 environmental objects.
Veteran's Day	Avoid fighting the Werewolf Berserkers.
We Deserve to Die	Defeat Valkarin.
We Must Become Stronger	Defeat Evanger.
Wood 'n' Wasp	Unlock Wasp and Wood Elemental.
Zaar Gets Lucky!	Have Zaar fulfill his most fervent desire.