if this was R&B I could absolutely name them but I don't listen to most rap actively enough. Like to enjoy an ENTIRE rap album it must be top tier. That being said:

Aquemini - okay this is clearly number one but the others are kind out of order

Black on Both Sides, Like Water For Chocolate, Stankonia -

this was my first stopping point. I'll fill the rest in with albums I just really like

Kendrick - Good Kid Maad City
Soul Food - Goodie Mob
Still Standing - Goodie Mob
ATLiens - Outkast
Illmatic...sure - Nas
Midnight Mauraders...why not? - Tribe
Uptown Saturday Night - Camp Lo
Blackstar - Mos & that nigga
Reflection Eternal - that nigga
The College Dropout - that other nigga
Things Fall Apart - The Ruts
Enter the 36 Chambers - Wu
One Day It'll All Make Sense - Com