I did this one in mission 8 - where early on you get by elevator to 'Transit control' - a room with a flashbang blueprint on some boxes just as you step out of the elevator. The reason I've chosen this place is:
- there is a single android, no humans (read below), and the alien also doesn't spawn there
- the transit control terminal is surrounded by additional terminals, which makes it a perfect spot to run in circles and get away from the android to use a medkit.
- it is not very far from a saving point in case you'd need multiple attempts.
After activating the terminal, a single human comes out of the elevator. You can either kill him or sneak to the switch that releases the android, who will kill the guy in your stead. Once your target is available and the human is dead, the strategy is as follows:
- sneak to the android and deliver first several blows.
- after he grabs your hand, retreat and try to stay close to some walls.
- let him grab you - and after spamming
try to hit him again. My observation is that the grabbing animation closer to walls more often ends in stunning the android for a brief moment, which you should use to hit him with your maintenance jack.
- rinse and repeat.
If your health drops below 50% - run away around the central terminal and use a medkit (it would be advisable to take a full stock, but you will probably only use one or two).
Of course doing it on easy will help :)