You completed your quest, plus all other secondary quests in the game. (21)
The secondary achievements in this game can be missed, if you do not do them correctly. It is not that you can easily miss doing them, it is simply that if you do not hand them in before continuing the main quest you can make it impossible to finish it (So make sure you hand them in before continuing the main quests!).

Main quests are not missable.

Secondary (Location) [Notes]

Ravens Rill

The Widows Revenge (Town)
Prized Possession (Town)
The Fishing Hole (Town)
Unlucky Merchant (You will run into him on the way to The Widows Revenge)
Gunderic Manor (After Freeing Anjali)
Hiding Out (Ravens Rill Town) [Will get automatically when leaving]
Gunderic Manor

A Wayward Soul (Gunderic Manor) [You have to destroy the stone]
East Forest

A Loss for words (At the very beginning on a body) [Very hard to miss, you basically walk over it]
Heroes Crypt

Heroes of Old (Outside Chapterhouse) [Not missable really, youll get talked to]
Relics of another age (Outside Entrance)
Swamp

Lost in the Swamp (Royal army camp)
Missionary Work (Outside First Peoples camp) [She will be waiting there on your way out]
Stonebridge

Supply Lines (As you enter town)
Mediations (Meister Hall, Fizzlewick, Two Parts)
Cryptic inheritance (Outside Crypts of the Sacred Blood)
Major Malfunction (Outside Crypts of the Sacred Blood)
Proof of sabotage (After Major Malfunction)
Uncovering the Past (Meister Hall, Mudgutter) [You can only get this after defeating the Dapper Old Gent]
Crypts of the Sacred blood

Stolen Shipments (Found after finding one of the three parts) [They look like scrolls on a box, in the side rooms. After finding one, it will guide you to the other two]
Foundry

Cogs and Wheels (Foundry Entrance)
Hostage Situation (Inside) [A man in a cage will give it to you]
Glitterdale Mountain

Making an Entrance (Outside)
Untamed Mountain (kaari pass)
Ibsen's Cave (Kaari pass)
All that Glitters (Inside)
The Prototype (Inside)
Building Bridges (Inside)
Spire Bailey