/bow before the following forms of Kroshik.
For the addon _NPCScan:
/npcscan add 69907 Kroshik egg/npcscan add 69908 Kroshik baby/npcscan add 69218 Kroshik adult/npcscan add 70226 Kroshik corpse
This achievement is fairly simple (/bowing before the forms), but there is one major thing you have to know first - only one form of Kroshik is up each day. It follows a fixed cycle... the life cycle of a Kroshik. The first part of the achievement is the Kroshik Egg, which will hatch after four days into a Baby Kroshik. After four more days it will grow up into a massive Adult Kroshik, and four days after that the Skumblade will take it to an altar and sacrifice it, so it becomes a Sacrificed Kroshik.
Server restarts do not appear to affect the life cycle of the Kroshik.
It does not necessarily start in order. On live on my server, Kroshik started as an adult and remained that way for 4 days. Only today has he progressed to Sacrificed Kroshik.
Edit: So far...