*Spoilers Below*
This takes place in the Taiga Level
Alyosha's fate is connected with our attitude towards the locals. Avoid killing the enemies - spend the majority of the chapter on sneaking and stunning human enemies. Going through settlements during the night is a good idea. Luckily for you, the majority of the enemies are carrying a crossbow - you will have plenty of time to run towards the opponents and stun them. If you come across prisoners, always rescue them. Thanks to that, Olga will appear at the end of the chapter - he will let you and Alyosha go in peace. You will also unlock the Alyosha achievement.
Otherwise, Alyosha will end up in a wheelchair.
Credit:
https://guides.gamepressure.com/metro-exodus/guide.asp?ID=48...