Complete all Job 10:22 missions.
2.8 Heralds of the Worm part 1
2.9 Heralds of the Worm part 2
2.10 Grave Danger
You must do this online and not in the Training mode (formally called Solo mode). Not as easy as the previous levels I had an ogre on all 3 missions and several Breakers, make sure you have plenty of ammunition in you primary weapon, I ran out and ended up using my hand gun at times.
Grave Danger
*** Spoiler - click to reveal ***Has 5 Snitches which call in the horde, expect to get plenty of special ridden mainly but you do get Breakers and on the final on I got 2 and an ogre.
Cryptozoologist Achievement
*** Spoiler - click to reveal ***The secret is in the Grave Danger mission, it’s in one of the crypts off the right hand road as you go up towards the church, as you walk into the crypt it’s on the left hand side of the doorway
.