Here is the full list of all 80 Dishonored Definitive Edition achievements worth 1,640 gamerscore.
You broke Lizzy Stride out of Coldridge Prison
You escaped prison and navigated the sewers undetected
You delivered (or attempted) the killing blow on Corvo
You killed 5 characters with Drop Assassination
You killed a tallboy using only your sword
You deactivated at least 5 security systems on Kingsparrow Island
You took possession of a fish
You acquired 15 equipment upgrades
You spared Daud’s life
After Coldridge Prison, you eluded 5 pursuers at once without killing them or leaving the map
You pickpocketed items worth a total of 200 coins
After escaping prison, you completed a mission, not alerting anyone and killing less than 5 people
After escaping Coldridge Prison, you completed a mission without alerting anyone
You completed the game in high chaos
You completed the game
You saved Empress Emily Kaldwin
You traveled 30 meters in less than 1 second
You recovered your belongings
You assassinated an assassin
You stayed in possession of others for most of a 3 minute period
You used a rat tunnel
You assassinated the Lord Regent, Hiram Burrows
You brought about the Lord Regent's fall from grace by broadcasting his crimes
You killed 6 enemies in less than 1 second
You abducted Anton Sokolov, Royal Physician
You killed an enemy with the Wall of Light
You located Lady Emily Kaldwin, heir to the throne
You made others kill 5 of their own allies
You fought 5 enemies at once and none of them survived
You protected Callista's uncle, Captain Geoff Curnow
You eliminated High Overseer Campbell
You assassinated 10 unaware enemies
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
Play from the first mission through Kaldwin's Bridge killing fewer than 10 characters
Complete the game without killing anyone
Cause 5 unintentional suicides
Kill 4 enemies in less than 1 second using the crossbow
Collect all the Sokolov paintings
Grab a live grenade and use it to kill an attacker
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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
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
Use an enemy lifted with Pull as a shield