Here is the full list of all 49 Metro: Last Light Redux achievements worth 1,000 gamerscore.
Completed the TOWER level.
Completed the KSHATRIYA level.
Completed the ANNA level.
Completed the KHAN level.
Completed the PAVEL level.
Completed the SPIDER LAIR level.
Completed the SNIPER TEAM level.
Spent 1 hour on the DEVELOPER level.
Completed the HEAVY SQUAD level.
Destroyed D6.
Completed the game in Spartan Mode.
Completed all 43 of Artyom's hidden Diary pages.
Killed Pavel.
Disarmed 10 Traps.
Saved D6.
Completed the game in Survival Mode.
Made Moskvin tell the truth with help from the Dark One.
Saved the Bear from the Watchmen after the fight.
Saw all Visions in the Dead City.
Found out about the Reds' plans.
Completed the BRIDGE level without a kill.
Removed your mask when Lesnitsky demanded.
Killed 10 enemies in a row with Throwing Knives.
Killed the Rhino.
Found and returned the crying child's Teddy Bear.
Drank at every occasion.
Rescued the Women and Children on the BANDITS level without raising alarm.
Killed 100 Human Enemies.
Stealthily killed 15 Enemies.
Opened 10 locked safe boxes.
Killed the Watchmen attacking the Railcar without taking any damage.
Killed 100 Mutants.
Made 10 Spiders flip belly-up.
Completed the REVOLUTION level without killing and raising an alarm.
Killed all armed enemies on the REVOLUTION level, including all reinforcements.
Spent 30 minutes' worth of Filters.
Escaped from the Red Line.
Watched the entire Theater Show.
Completed the ECHOES level undetected by the Watchmen.
Burned 50 Cobwebs.
Completed the FACILITY level without killing or raising alarm.
Used 10 Lever Switches.
Turned off 40 Lights without breaking them.
Completed the SEPARATION level without killing or raising alarm.
Escaped the chasing Nazis on the REICH level without being caught once.
Freed the Prisoners.
Finished the ASHES level without taking a hit.
Completed training sequence.
Chosen three primary weapons that use different ammo.