Just thought a thread that shows how to recruit each unit for the steam achievements would be useful. Please fill in details 
I've only gotten 3 of the 7 so far that were listed as Steam Achievements.
Mausolos:
It is a quest in a tomb location. You enter, and put the head on a statue. A golem (Mausolos) will show up, and you get the option to say something along the lines of 'you did not do it'. It will then reveal another lair (the robber) that you have to clear out.
Kill the robber, go back, and Mausolos will join you.
He's a 2 movement, high armour and HP unit with death ward.
Ascian:
Random event. You get a quest line to explore a lost temple or something, and it eventually gives you a collar which can tame twisted units. Ascian will be somewhere on the map, and you use the collar to tame it.
Gallowman:
I actually got him from having high fame. He was a hero that showed up at around... 500 fame value as I recall.
I suspect all of the remaining 4 are recruitments from fame, but would like confirmation
Nen Ratcatcher
- Recruitable from fame.
Tuatha
- Recruitable from fame.
Raza the Wild
- Recruitable from fame.
Kasst
- Recruitable from fame.
