Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Close Encounter	Have a run-in with your quarry.
A Long Time Coming	Complete the item trading quest-line that spans all five acts.
Because You're so Nice	But is karma canon?
Desperation	Surely, this pinecone will do the trick...
Didn't See That One Coming	Adamantly refuse to learn.
Headshot	Plus 50.
I Missed You	Get your sword back.
If it Bleeds...	Complete Act 1's contract after failing to employ the device.
Now You Know	Curiosity got the best of you.
Third Time's the Charm	Score three hits on the first contract, netting an easy victory.
WALKERMAAAN!	Complete the prologue.
Welcome to Midgard	Complete Act 1.