Here is the full list of all 56 Unavowed achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Free at last
The only way to be sure
Resistance is futile
Free of torment at last
Select Mandana and Vicki four times for missions
Choose Vicki four times for missions
Choose Mandana six times for missions
Better safe than sorry
Embark on three missions with an all female party
No muse in Brooklyn tonight...
Show sympathy for one of nature's creatures
Welcome Logan to the party
Enter the Eddings house using Vicki
Welcome Vicki to the party
Nobody has to die tonight
A new world. A new life.
Get to the truth of what happened
Food tames the beast
Complete the female cop origin
Complete the male cop origin
Complete the male bartender origin
Complete the female bartender origin
Complete the male actor origin
Complete the female actor origin
Defeat a foe with firsthand knowledge
Why take the risk?
Perhaps it was meant to be this way...
Enter the Eddings house using Mandana
Needlessly unlock the same door in two different ways
Calamari for a year!
Well skewered, Mandana
Disperse the Staten Island ghost
Finish three missions with an all male party
Visit a special location on a certain day
Disperse the ghost on Wall Street
Embark on four missions with Eli and Logan
Head out four times with Eli and Vicki
Start four missions with Mandana and Logan
Keep Eli and Mandana together for six missions
Choose Eli six times for missions
Choose Logan four times for missions
Calli returns to her former position
There's a new muse in town
Nice try
A deal has been struck
Kevin now has a second chance
Free the Brooklyn ghost
Reach the final end with your full crew in tow
We'll do it right this time
Finish a jailbreak without getting chided by a ghost
Leave commentary mode on for the entire game, from the opening menu to the closing credits.
Never ask your friends for a hint
A villain escapes her punishment
There's a new statue in the North Grove
No mercy for the trees
Reach the final confrontation alone