Tonic Man

Tonic Man is an achievement/trophy in Metro 2033 Redux.

Overview
This achievement is awarded for using medkits 75 times. This will likely unlock through natural gameplay, but you can also load a chapter, take damage, use a medkit, reload and repeat. This is very easily accomplished in the Dead City level, as in a certain part of the level, an autosave occurs very close to a radiation hotspot. Stand in the hotspot for a while, use all five medkits, reload the save and do it again until enough medkit uses are farmed.