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