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