Here is the full list of all 50 Assassin's Creed Mirage achievements worth 1,000 gamerscore.
Complete the Prologue
Become an Initiate of the Hidden Ones
Eliminate Al-Ghul
Eliminate Al-Rabisu
Eliminate Al-Pairika
Eliminate Al-Mardikhwar
Eliminate the Head of the Order
Discover Basim's past
Reach the maximum Hidden One Rank
Unlock all skills
Fully upgrade a weapon
Fully upgrade an outfit
Apply dye to an outfit
Obtain both disguises
Open a token chest
Obtain a total of 10 elixirs
Synchronize all viewpoints
Tag 100 guards using Enkidu
Fully explore all territories
Complete 10 faction contracts
Complete a Tale from Baghdad
Bring all 7 lost books to Al-Jahiz
Obtain a treasure by solving an enigma
Fully upgrade all tools
Kill 75 guards with throwing knives
Headshot 20 guards with throwing knives
Put 10 guards to sleep with blowdarts
Have 10 guards trigger traps
Affect 20 guards with smoke bombs
Distract 10 guards with noisemakers
Pickpocket 50 people
Pickpocket a guard affected by a blowdart
Pickpocket all 18 artifacts and bring them to Dervis
Save up 2007 dirhams
Use benches to pass time 5 times
Pay musicians 5 times
Pay mercenaries 5 times
Pay merchant groups 5 times
Assassinate 10 guards while blending with the crowd
Assassinate 10 guards from hiding spots
Defeat a Shakiriyya in combat
Destroy a Horn Bearer's horn with a throwing knife
Stay at maximum notoriety for 10 minutes
At maximum notoriety, become anonymous by tearing down wanted posters
Use the services of a Munadi 3 times
Kill 5 guards with one use of Assassin's Focus
Survive 10 minutes in open conflict
Collapse 20 scaffolding structures
Assassinate 10 guards in a row without triggering open conflict
Hide 5 bodies in bales of hay