The achievement unlocks after the
satisfactory completion of a companion’s entire questline AFTER the companion is recruited. The earliest an entire questline can be completed is after leaving Groundbreaker. Note that SAM only has a recruitment quest:
The Cleaning Machine. Since he has no quests after recruiting him, he does not count towards the achievement. The achievement will pop once the first of the following five questlines is completed:
- Parvati: Drinking Sapphire Wine & Don't Bite The Sun
- Vicar Max: The Illustrated Manual & The Empty Man
- Felix: Friendship’s Due
- Ellie: Worst Contact & The Low Crusade
- Nyoka: Passion Pills & Star-Crossed Troopers
Ellie’s questline is probably the simplest although the complexity of the questlines varies depending on whether one is on the Halcyon Path or the Phineas Path. Ellie is recruited on Groundbreaker by completing
Worst Contact. The Low Crusade begins in Byzantium and is concluded on Monarch.
Both segments are dialog related which is why Ellie’s questline can be considered the simplest. The quickest way to complete the quest is to pass an intimidate skill check (in the 30-40 range) with the
insurance agent in
Fallbrook on Monarch. Taking SAM or Vicar Max along with Ellie will boost your Intimidate skill as will wearing armor &/or helmet that confers a dialog skills or intimidate bonus. Talk to Ellie after the insurance agent acquiesces to complete the questline. If this is the first companion questline completed, the achievement will pop.