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