Suits:Before getting into the train car at Armory Station, you can purchase a Stealth Suit for 100 military cartridges from the vendor across from the Ammo Exchange. There is a vendor next to that one that sells an Armor Suit that decreases damage. Both suits can be worn simultaneously. A similar Armor Suit is also sold by a vendor next to the Ammo Exchange in Polis.Nightvision goggles:Besides buying the Sneaking Suit at Armory Station, you can get a pair of nightvision goggles at Front Lines. When in control of Artyom, turn around and follow the train tracks. The nightvision goggles will be in a red breaker box guarded by two soldiers.Extended filter:Avoid jumping and sprinting to extend the use of your filter.Achievements:ACHIEVEMENT – HOW TO UNLOCKMetro Trader (20 points) – Make 10 deals in weapon shops. Wheeler-Dealer (25 points) – Exchange 500 Military Grade 5.45 rounds at Exchange kiosks. Nosalis hunter (30 points) – Kill 30 nosalises. Fire in the hole (25 points) – Kill 20 lurkers. Heavy Reader (20 points) – Kill a librarian. Ka-Boom! (30 points) – Explode 10 enemies. Ranger (30 points) – Find all Ranger stashes in Dead City 1 and 2 Old school (30 points) – Kill 30 enemies with the double-barreled shotgun. Exorcist (20 points) – Complete levels “Ghosts” and “Anomaly” without dying. Demolitionist (30 points) – Blow up the tunnel and airlock at “Cursed” station. Air gunner (30 points) – Kill 30 enemies using pneumatic weapons. Cowboy (30 points) – Kill 30 enemies using revolvers. Inquisitor (35 points) – Kill 2 demons. Rescue Ranger (30 points) – Save a group of “Reds” from Fascist captivity. Tank Buster (20 points) – Destroy fascists