Counter-Serum Achievement/Trophy Guide (Missable)Mission 3: The Good Doctor
The counter-serum achievement/trophy can be earned by talking to Dr. Hypatia on your ship if you saved her in the 'Good Doctor' mission. To do this you must do the following steps:
Step 1 - Find Dr. Hypatia in her lab and her assistant Vasco will be in the room behind her. Talk to Vasco to start up a cutscene.
Step 2 - Make your way to Vasco's lab and open up the safe to get the cure instructions. You will have the code to the safe if you talked to Vasco beforehand.
Step 3 - Grab the syringe from Vasco's lab and go get the NestKeper's blood in the room beside you. Now come back and interact with the beaker and turn on on the fire.
Step 4 - Return to the room where the now turned doctor is hunting you and get in a position above her (use the beams).
Step 5 - Drop down and administer the antidote, this will cause her to revert back to normal and you can talk to her now.
Step 6 - When you return to your ship simply talk to the doctor and you will get the achievement.
Here is an easy to follow video guide for this achievement/trophy.