After the Nightfall

This emblem unlocks after you beat the Time Trial times of each Nightfall Strike; these times need to be obtained after Forsaken's release. The site destiny.report has a great tool to track your Nightfall times, I've included the link below. Thanks to the "DestinyTheGame" subreddit for figuring out the times for each hidden Time Trial. Likely no longer obtainable after the release of Beyond Light and the DCV.

Everyone Can Play

Purchase the Disability Awareness pin, available in the Bungie Store 2021-10-01. Name changed from "All for One" in Destiny 2 v3.3.0.3.

Tyrant

Obtained after clearing the King's Fall raid and all encounter challenges within the first 24 hours.

A Broken Throne

Clear Crota's End during the 48 hour Challenge Mode window.

The Reaper

This emblem dropped upon completion of the "Triumphant Reaper" Triumph. No longer obtainable after Gambit Prime was retired

The Collector

This emblem dropped upon completion of the "Triumphant Collector" Triumph. No longer obtainable once Gambit Prime was retired.

The Sentry

This emblem dropped upon completion of the "Triumphant Sentry" Triumph. No longer obtainable after Gambit Prime was retired.

The Invader

This emblem dropped upon completion of the "Triumphant Invader" Triumph. No longer obtainable once Gambit Prime was retired.

Warminded

Obtained by accessing all forty (40) Sleeper Nodes on Mars. No longer obtainable after Mars entered the DCV.

Disdain for Gold

Complete the Triumph "Season 7: Nightfall." This requires 25 Nightfall completions during Season 07

A Cold Wind Blowin'

Complete the "Rogue Light" Triumph during Season 04. Once you redeem the Triumph, the Drifter will sell the emblem (only during Season 04).

Wish Granter

Complete a Guided Game raid as a guide.

Simulant Spring

Complete all Triumphs during the Revelry 2019.

Carrhae

Purchase the "Destiny Ghost Vinyl - Generalist Shell" and the emblem code will come in the box. As of early 2021, these Ghost Shells don't seem to be readily available. You may still be able to find them second hand, but please make sure any ones you buy come with the emblem code.

Emblem of Synth

Purchase any item from the Bungie Store during the Season of Opulence.

Death to the Deathless

This emblem randomly dropped upon completion of this Nightfall. No longer obtainable since this strike has entered the DCV.

Untouched by Opulence

Complete a solo flawless run of the Duality dungeon.

Eternally Triumphant

Earn 400 points in the 2018 Solstice of Heroes 2018 event by completing all the Triumphs available.

Vex Scholar

Obtained by equipping the full "Kairos Function" set on a Warlock. No longer available as a result of Mercury entering the DCV.

New Blue

For Guardians that had an existing Bungie Store account, you needed to reset your password on the new Bungie Store before August 13th, 2021 at 11:59PM PST. Emblem codes were emailed starting August 6th, 2021.