Reddit user siegfurd has put up a visual guide with all Altars of Lilith locations on the Diablo IV Beta.

Altars of Lilith provide bonuses for any character you play on a realm and you can collect up to 28 altars on the Beta. Here is a visual map created by siegfurd.

Source: Reddit

Source: News Latest Topics https://www.icy-veins.com/forums/topic/71802-altars-of-lilith-guide-all-locations-on-the-diablo-4-beta/