Solasta: Crown of the Magister

For this achievement you need to escape Caer Lem with Lisbath. Caer Lem is very early in the story. After 2 fights you'll find the 4 people you're looking for. Talk to everyone and then you'll be told to talk to everyone again. Make a save so you can get the other achievements for this choice and talk to Robar, say you want him to take command (there didn't seem to be a skill check). A lizard will appear, beat it down and after some scenes you'll be in a cave and this will unlock. Lisbath will come with Robar, which will give you another achievement.