Here is the full list of all 56 Unavowed achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Welcome Logan to the party
Enter the Eddings house using Mandana
Perhaps it was meant to be this way...
A new world. A new life.
Food tames the beast
Complete the male bartender origin
Complete the male cop origin
Complete the female cop 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?
Enter the Eddings house using Vicki
Needlessly unlock the same door in two different ways
Calamari for a year!
Well skewered, Mandana
Welcome Vicki to the party
Disperse the Staten Island ghost
Finish three missions with an all male party
Embark on three missions with an all female party
Get to the truth of what happened
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
Select Mandana and Vicki four times for missions
Start four missions with Mandana and Logan
Keep Eli and Mandana together for six missions
Choose Eli six times for missions
Choose Mandana six times for missions
Choose Vicki four times for missions
Choose Logan four times for missions
Calli returns to her former position
There's a new muse in town
No muse in Brooklyn tonight...
Nice try
A deal has been struck
Better safe than sorry
Free of torment at last
Kevin now has a second chance
Free the Brooklyn ghost
Reach the final end with your full crew in tow
Free at last
We'll do it right this time
The only way to be sure
Resistance is futile
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
Nobody has to die tonight
A villain escapes her punishment
Show sympathy for one of nature's creatures
There's a new statue in the North Grove
No mercy for the trees
Reach the final confrontation alone