Not the dev but...
1. After rescuing the minotaur from Vicoria you need to go to the forest path(where you find aconitum) and look for the cave entrance there, after just follow the tunnel until you emerge at the farm
2. The group hug you get during the celebration after finishing the lizards's treasure, and it's just a hug with everyone
3. You get that at the same celebration after you get Roushk's first heart at the lake already having Roth's
4. Xer's first heart comes from one of his dialogue options if I'm not mistaken when you let him keep doming you even if he's... Well himself