Here is the full list of all 49 Metro: Last Light Redux achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
Complete the PAVEL level.
Make 10 Spiders flip belly-up.
Complete the SPIDER LAIR level.
Complete the SNIPER TEAM level.
Complete the KSHATRIYA level.
Complete the HEAVY SQUAD level.
Save D6.
Complete the game in Spartan Mode.
Complete all 43 of Artyom's hidden Diary pages.
Make Moskvin tell the truth with help from the Dark One.
Save the Bear from the Watchmen after the fight.
See all Visions in the Dead City.
Disarm 10 Traps.
Find out about the Reds' plans.
Remove your mask when Lesnitsky demands it.
Open 10 locked safe boxes.
Kill the Rhino.
Find and return the crying child's Teddy Bear.
Kill 100 Mutants.
Rescue the Women and Children on the BANDITS level without raising alarm.
Kill 100 Human Enemies.
Stealthily kill 15 Enemies.
Kill the Watchmen attacking the Railcar without taking any damage.
Spend 30 minutes' worth of Filters.
Complete the REVOLUTION level without killing and raising an alarm.
Turn off 40 Lights without breaking them.
Kill 10 enemies in a row with Throwing Knives.
Escape from the Red Line.
Watch the entire Theater Show.
Complete the ECHOES level undetected by the Watchmen.
Burn 50 Cobwebs.
Use 10 Lever Switches.
Complete the FACILITY level without killing or raising alarm.
Escape the chasing Nazis on the REICH level without being caught once.
Free the Prisoners.
Finish the ASHES level without taking a hit.
Complete training sequence.
Choose three primary weapons that use different ammo.
Destroy D6.
Kill all armed enemies on the REVOLUTION level, including all reinforcements.
Complete the SEPARATION level without killing or raising alarm.
Drink at every occasion.
Complete the BRIDGE level without a kill.
Kill Pavel.
Complete the game in Survival Mode.
Complete the TOWER level.
Spend 1 hour on the DEVELOPER level.
Complete the KHAN level.
Complete the ANNA level.