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