Here is the full list of all 80 Dishonored Definitive Edition achievements worth 1,640 gamerscore.
You completed all the Slackjaw side missions
You recovered your belongings
You assassinated 10 unaware enemies
You brought about the Lord Regent's fall from grace by broadcasting his crimes
You made others kill 5 of their own allies
You used a rat tunnel
You pickpocketed items worth a total of 200 coins
You acquired 15 equipment upgrades
You abducted Anton Sokolov, Royal Physician
You fought 5 enemies at once and none of them survived
You located Lady Emily Kaldwin, heir to the throne
You assassinated an assassin
You protected Callista's uncle, Captain Geoff Curnow
You eliminated High Overseer Campbell
You collected 10 bone charms
You escaped Coldridge Prison
Kill characters with each weapon and offensive gadget
Complete all missions after the prologue, alerting or killing no one but the key targets
Complete all missions after the prologue without alerting anyone
Finish the game without purchasing any supernatural powers or enhancements, besides Blink
Kill an enemy using a Wall of Light
After escaping prison, complete a mission without alerting anyone, and kill less than 5 people
After escaping Coldridge Prison, complete a single mission without alerting anyone
Kill 5 characters with Drop Assassination
Play from the first mission through Kaldwin's Bridge killing fewer than 10 characters
Complete the game without killing anyone
Cause 5 unintentional suicides
Stay in possession of others for most of a 3 minute period
Kill 4 enemies in less than 1 second using the crossbow
Travel 30 meters in less than 1 second
Kill 6 enemies in less than 1 second
Collect all the Sokolov paintings
After Coldridge Prison, elude 5 pursuers at once without killing them or leaving the map
Assassinate the Lord Regent, Hiram Burrows
Complete the game
Grab a live grenade and use it to kill an attacker
Kill a tallboy with only your sword
ACH_Dunwall in Chaos_HOWTO
ACH_Just Dark Enough_HOWTO
ACH_Vanished_HOWTO
ACH_Gentleman Caller_HOWTO
ACH_The Art of the Steal_HOWTO
ACH_An Unfortunate Accident_HOWTO
ACH_Well Mannered_HOWTO
ACH_King of the World_HOWTO
ACH_Mercy is the Mark_HOWTO
ACH_Lights Out_HOWTO
ACH_Long Live the Empress_HOWTO
ACH_Poetic Justice_HOWTO
ACH_Alive Without Breath_HOWTO
Find Emily's doll hidden in each of the 10 challenges
Perform a drop assassination of at least 150 meters in the Kill Cascade challenge
Complete Train Runner before the train arrives at the station
Finish Mystery Foe without using any active supernatural powers
Get to Wave 13 in Back Alley Brawl killing all combatants personally
In Bonfires, perform all the special combination jumps in 1 round
Complete Assassin's Run with 100% accuracy using only head shots
Find all of the collectable figurines in Burglar on Expert
Finish Chain Kill or Bend Time Massacre without failing any wave, including bonuses
Complete all Normal and Expert challenges with a 3-Stars rating
Get the information you need from the Rothwild Slaughterhouse
Purchase all of the Favors in The Knife of Dunwall
Complete The Knife of Dunwall in High Chaos
Complete The Knife of Dunwall in Low Chaos
Complete The Knife of Dunwall without alerting anyone
Complete The Knife of Dunwall without killing anyone
Attach an arc mine to a rat, resulting in a kill
Meet with Thalia Timsh, the Barrister's Niece
Speak with the statue of Delilah Copperspoon in Timsh's estate
Perform a drop assassination from atop the Empress statue in The Knife of Dunwall
Break Lizzy Stride out of Coldridge Prison
Restore the Undine to working condition
Purchase at least 8 favors in The Brigmore Witches
Complete The Brigmore Witches in High Chaos
Complete The Brigmore Witches in Low Chaos
Complete The Brigmore Witches without alerting anyone
Complete The Brigmore Witches without killing anyone
Survive The Brigmore Witches in low chaos with 10,000 coins
Deliver (or attempt) the killing blow on Corvo
Use an enemy lifted with Pull as a shield