Knowledge is power achievement (logs)
 

I can't figure out which log I'm missing, here's a list of the ones I have:

MIA
CONRAD
boney shield
Screamer
Mauler
Ranged
Healer
Larval Burst
Stunner
Charger
Moss Creature

I've googled it and youtubed it, but they only tell/show locations, but not the names of the log.