Here is the full list of all 20 35MM achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Die
Listen the sound anomaly at the first location
Find a room with mannequins in city
Reach the finals with a partner
Open the safe in the city
Listen to the radio signal in tunnels
Find the secret documents in the safe
Rate the abstract picture on location "Bor"
Find "easter egg" from the first game of author
Help to grandfather in town
Find the bodyes of hanged people over the railway
Kill grandmother in the old village
Reach the finals alone
Kill all dogs without reloading weapons
Find anomalous zone in the tunnels
Give your partner a first aid kit
Call to Hell
Assemble the children's puzzle
Light a candles in an abandoned church
Listen the airwaves in the hospital