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