A useful guide will help you how to obtain all achievements in game!
 

1) Singleplayer Achievements.

The Great Escape

Escape from Castle Vahkmaar.

Into The Fire

Complete Alsorna Introduction.

Old Wounds

Complete Chapter I in the Single Player Campaign.

The Road Less Traveled

Complete Chapter II in the Single Player Campaign.

Last Stand

Complete Chapter III in the Single Player Campaign.

Liberation

Completed the Single Player Campaign on any difficulty.

Alchemist

Create a potion.

Hammer Time!

Upgrade a weapon or piece of armor.

Grey Wizard

Create a spell.

Clairvoyant

Use the Oculus.

Minstrel Hero

Perform a song, hitting 100% of the notes.

Slight of Hand

Steal from 25 people.

The Antaloorian Job

Lockpick 50 locks.

Hero

Reach Level 20.

Legend

Reach Level 40.

Fortune & Glory

Explore 25 dungeons.

Lost

Collect all 4 Lost Runes: Human, Elven, Dwarven and Orcish.

2) Sidequests.

Dances with Mops

Complete the Mage’s Guild Questline.

Prince of Thieves

Complete The Thieve’s Guild Questline.

I am Spartacus!

Survive the Arena.

The Merchant of Antaloor

Complete the Merchant’s Guild Questline.

Last Man Standing

Complete the Brotherhood Questline.

Hero for Hire

Complete 10 Bulletin Board Quests.

It’s Alive

Wake the Army of Golems.

I See Dead People…

Receive the gift of the Scavengers..

Desert Rose

Confront Mirage.

3) Fight (only singleplayer).

Sweep the Leg

Effectively use Knockdown 30 times.

El Mentalista

Effectively use Battle Cry 75 times.

Who’s next?

Kill 20 enemies using Death Strike.

It’s a Trap!

Set 40 traps or bombs.

White Wizard

Kill 50 enemies with magic.

Beastmaster

Summon 50 monsters.

Man in Tights

Kill 50 enemies using Multi Arrows.

Crazy Like a Lox

Kill 30 enemies using Fire Arrow.

4) Multiplayer Achievements.

Adventure Part I

Complete Chapter I in the Multiplayer Campaign.

Adventure Part II

Complete Chapter II in the Multiplayer Campaign.

Adventure Part III

Complete Chapter III in the Multiplayer Campaign.

Adventure Part IV

Complete Chapter IV in the Multiplayer Campaign.

Adventure Part V

Complete Chapter V in the Multiplayer Campaign.

Adventure Part VI

Complete Chapter VI in the Multiplayer Campaign.

Adventure Part VII

Complete Chapter VII in the Multiplayer Campaign.

Ruthless

Win 5 Deathmatches.

Duelist

Win 5 Duels.

Gemologist

Win 5 Crystal Capture matches.

Settler

Build 5 buildings in Village Mode.

Contractor

Build 15 buildings in Village Mode.

5) DLC Achievements.

Grim Reaper

Slay the Bailiff and his minions. (DLC: Pirates of the Flying Fortress)

Blind Fury

Kill the Basilisk. (PotFF)

Lover’s Conspiracy

Finish the Lovers’ Conspiracy storyline. (PotFF)

Who Watches the Watchman?

Defeat Corr Amarok. (PotFF)

Primal Fears

Annihilate the Phobias. (PotFF)

Pirates of the Flying Fortress

Complete Pirates of the Flying Fortress. (PotFF)

The Pursuit of Happiness

Find your Treasure. (PotFF)

Tell Willy I Got ‘Em

Kill 100 enemies with crossbow. (PotFF)

Yo-ho, Yo-ho!

Reach 100 points of reputation amongst the pirates. (PotFF)

Return of the Fellowship

Complete 4 new multiplayer adventure maps. (DLC: Multiplayer Map Pack 1)

This is all for Two Worlds II 100% Complete Achievements Guide + Walkthrough hope you enjoy the post. If you believe we forget or we should update the post please let us know via comment, we will try our best to fix how fast is possible! Have a great day!