Here is the full list of all 49 Metro: Last Light Redux achievements worth 1,000 gamerscore.
Spent 1 hour on the DEVELOPER level.
Completed the TOWER level.
Completed the KSHATRIYA level.
Completed the SNIPER TEAM level.
Completed the SPIDER LAIR level.
Disarmed 10 Traps.
Completed the PAVEL level.
Completed the KHAN level.
Destroyed D6.
Completed the game in Spartan Mode.
Killed Pavel.
Completed the BRIDGE level without a kill.
Completed the ANNA level.
Killed 10 enemies in a row with Throwing Knives.
Killed the Watchmen attacking the Railcar without taking any damage.
Killed all armed enemies on the REVOLUTION level, including all reinforcements.
Completed the REVOLUTION level without killing and raising an alarm.
Completed the FACILITY level without killing or raising alarm.
Completed the SEPARATION level without killing or raising alarm.
Completed the HEAVY SQUAD level.
Saved D6.
Completed the game in Survival 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.
Found out about the Reds' plans.
Opened 10 locked safe boxes.
Burned 50 Cobwebs.
Removed your mask when Lesnitsky demanded.
Killed the Rhino.
Turned off 40 Lights without breaking them.
Killed 100 Mutants.
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.
Spent 30 minutes' worth of Filters.
Made 10 Spiders flip belly-up.
Killed 100 Human Enemies.
Escaped from the Red Line.
Watched the entire Theater Show.
Completed the ECHOES level undetected by the Watchmen.
Used 10 Lever Switches.
Stealthily killed 15 Enemies.
Chosen three primary weapons that use different ammo.
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.