Trophy and Achievement Guide - Divinity Original Sin 2

 See: Villian.
The most reliable and easy way to get this achievement is to load a save where you have Source Vampirism and to just use it on a 5-10 spirits and you should get the tag right away.

See: Teleportation 
Useful item: Teleportation Glove

It is recommended to do this in the early game - the damage from teleport doesn't really scale, so do it when enemies have fewer hit points

See: Mask of the Shapeshifter 
And also: Face Ripper

Must be all races on the same character.

Requires: Spirit Vision
Requires: Pet Pal

Kill an animal and then use Spirit Vision with the Pet Pal perk speak to it. You can also use Spirit Vision with dead shark in Driftwood's beach.

Use the ladder next to Alexander and Dallis to avoid the first encounter, later you can use the wall opposite the one you climbed up on, stand next to the balista and teleport Alexander, not Dallis, on the wall. Damage Alexander's health and Dallas will flee leaving her hammer behind.

Alternatively, you can explode a barrel of deathfog beside Alexander and they will all begin to retreat. (You will need to grab deathfrog from the ship).

The Great Escape

Cat's Out of the Bag!

See: The Collar

See: Bless 
And: Dark Cavern

Kill Slane on the island of Fort Joy.
If you need assistance killing Slane or anyone in the game, see: Telekinesis
Part of: The Purged Dragon

 Incompatible with: Swashbuckler

Swashbuckler

Existential Crisis

See: A Danger to Herself and Others

You will need the scholar tag on one of your characters. Mercenaries you hire do not have any "additional" tags and you can not manipulate tags with the magic mirror.

The map marks where the eggs are (the green areas), in addition there is also a single egg in the starting area of the cove where the voidwoken first capture you. Some of the eggs are on the walls. If you're careful, you should be able to get all of them outside of the nest without missing any.
The nest itself requires extra careful examination as there are few spots you may miss. If at first you don't get the achievement, continue searching the nest, and look up guides/pictures if you haven't already.

Either sneak away while controlling Saheila or kill a few key people before engaging Roost to make the sneaking away easier or kill everyone outside and then just walk out with Saheila.

Incompatible with: Lawyer Up / Isle of the Gods
You need to maintain less than 3 source points and prevent yourself from being able to increase it. (So your god can't tell you). You also need to kill The Advocate before he tells you the location of the Council of Seven's.
Therefore, you need to either reject or kill: Mordus, Ryker, The Advocate, Jahan, Almira, Hannag, and Saheila. Once you've done so, an owl will give you a message. See: Source Masters

The Seven Altars

Chapter 5:
Nameless Isle

Chapter 5:
Nameless Isle

Story Related
See: The Last Stand of the Magisters

Required: Persuasion
See: A Craftsman of Dreams and Nightmares

See: A Craftsman of Dreams and Nightmares 

and: Finding Lord Arhu  
Incompatible with: Puritan's Walk

Puritan's Walk

There are two ways to get the achievement,
1) Do not steal/kill/side with voidwoken, since the start.
2) Once you get to Arx, dismiss one of your companions, and hire a mercenary, answer to the Statue Test with the mercenary you just hired (mercenaries are considered new characters, so pure of heart).
Incompatible with: The Back Door

See: The Secrets of the Dwarves

With Beast as a companion, you need to keep all other party members away from Queen Justinia when speaking to her in the secret room behind the Deathfog machine after the battle with Isbeil. Beast needs to initiate the dialogue alone and you'll get the achievement by forgiving her. 

An Apple A Day  

Doctor: Heal Thyself

A Wolf Avenged

Required Ascended Hero: Fane
For this, have no character pick up on the option of divinity
Note: You do not have to follow the covenant route to unlock this at the end