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