Realms of Arkania: Star Trail

To resurrect a hero, you need to visit a temple. There's at least one in every city, so it shouldn't be hard to find one. In addition to this, you'll need to have so many ducats available to donate to that same temple before the god will bring your companion to life. At the very least, I would have 50, but the higher the coin value, the better. You won't need more than 100 ducats though, as once you reach 100, the value resets with that god.

Don't forget that you can see the map of a town with . It might help if you can't find a temple around.

Once you're inside, and you have a party member in need of resurrection, press and select the option to donate funds to the temple. (upper right) Then choose "pray for a miracle". (right) You might not get it on the first try, so I would do it a few times to be sure. Once again, if you can't get it after so many tries, you may need to up the value of your donation. (donating all of the funds at once seems to have better luck). After about 80, it seems to work almost every time.

Once your prayer is answered, your party member will come back to life and the achievement will pop!