For the achievement, see Behemoth Notes (achievement).
Behemoth notes detail

The Behemoth Notes are a series of journals that players can find while dungeoneering in Daemonheim. Players can view these by talking to the Dungeoneering tutor.

Notes Obtained from On floor
Part 1 Gluttonous behemoth Floors 1-11
Part 2 Bulwark beast Floors 12-17, 30-35
Part 3 Stomp Floors 18-29
Part 4 Runebound behemoth Floors 36-47
Part 5 Hope devourer Floors 51-60
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