Only the Forsaken seals count for this achievement.
[quote]The Seal the Deal Achievement/Trophy will only unlock if a player owns Forsaken and one of the following Forsaken seals is earned:
[quote]Wayfarer
Dredgen
Unbroken
Chronicler
Cursebreaker
Rivensbane[/quote][/quote]
https://www.bungie.net/en/Help/Article/48484
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That's real saddening, but I'll get to work since theres not much else to do for pve players.