Here is the full list of all 49 Metro: Last Light Redux achievements worth 1,000 gamerscore.
Destroyed D6.
Completed the game in Survival Mode.
Completed the KSHATRIYA level.
Killed all armed enemies on the REVOLUTION level, including all reinforcements.
Completed the SNIPER TEAM level.
Completed the PAVEL level.
Spent 1 hour on the DEVELOPER level.
Completed the KHAN level.
Completed the ANNA level.
Completed the SPIDER LAIR level.
Killed the Watchmen attacking the Railcar without taking any damage.
Completed the TOWER level.
Killed Pavel.
Killed 10 enemies in a row with Throwing Knives.
Stealthily killed 15 Enemies.
Completed the HEAVY SQUAD level.
Killed 100 Human Enemies.
Saved D6.
Completed the game in Spartan Mode.
Completed all 43 of Artyom's hidden Diary pages.
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.
Opened 10 locked safe boxes.
Found out about the Reds' plans.
Disarmed 10 Traps.
Completed the BRIDGE level without a kill.
Removed your mask when Lesnitsky demanded.
Killed the Rhino.
Killed 100 Mutants.
Spent 30 minutes' worth of Filters.
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.
Made 10 Spiders flip belly-up.
Completed the REVOLUTION level without killing and raising an alarm.
Used 10 Lever Switches.
Turned off 40 Lights without breaking them.
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.
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.