This achievement is gained upon defeating the following rare monsters in Velketor's Labyrinth:

The Brood Master
The Brood Mother
Crystal Eyes
a deadly blizzard hunter
a deathly shard spectre
Errkak Icepaw
Failed Experiment Beza
Failed Experiment Izah
a fierce blizzard hunter
a Frenzied Velium Broodling
a Frenzied Velium Stalker
a frosty gargoyle watcher
a frozen gargoyle master
Gregendek Icepaw
an Icepaw berserker
an Icepaw warlord
Jelek Icepaw
Kalik Icepaw
Keljemor
Khelkar Icepaw
Laryk Icepaw
Leljemor
Marlek Icepaw
Meljemor
Rijoely
Rowwek Icepaw
a terrible crystal shard
Tijoely
Tpos Icepaw
Ular Icepaw
Velketor`s Experiment Lena
Velketor`s Experiment Uzah
Venar Icepaw