The Tribute Hall

Complete the "Thrifty" Triumph, requiring you to reach the maximum tribute discount (80%) with the Visage of Calus. Once you redeem the Triumph the emblem will drop. No longer obtainable since The Tribute Hall entered the DCV.

Virescent

Earned as a rare drop in the Verdant Forest by defeating two or more bosses in a single run during the Season of the Drifter.

Obsidian Dreams

Complete "The Lost Souvenir" quest. This requires you to solve the "Lost Datapad" item. No longer obtainable after the forges entered the DCV.

Rasmussen's Gift

Source: Solve the Norse glyph puzzle.

Ludomaniacal

Earned by performing an Infamy (Gambit) rank reset three (3) times in a single season.

Wheel of Fortune

Complete a flawless run of Tier III Reckoning twice, once with each boss.

Crown of Sorrow

Complete the raid Crown of Sorrow once. This dropped once you redeemed the Triumph associated with your first clear. No longer obtainable since Crown of Sorrow entered the DCV.

No More Flame Turrets

This emblem drops randomly on Nightfall: The Ordeal clears of this strike.

Tainted Water

This emblem drops randomly on Nightfall: The Ordeal clears of this strike.

Moments of Triumph 2019

Complete any Triumph from the 2019 Moments of Triumph set before 2019-08-27. As of Destiny 2 v2.5.2.1, the end date of Moments of Triumph 2019 has been extended to 2019-09-17.

Return TYRANT++

Obtained after defeating 25 Escalation Protocol bosses.

Universal Hero

Released to celebrate the first anniversary of Destiny 2 on PC. If you played on PC during the first year, Destiny 2 rewarded a Triumph and this emblem.

Recovered Memories

Complete the "Scourge of the Past" raid once. No longer obtainable after Scourge of the Past entered the DCV.

Benighted Omen

Purchase the Destiny 2: Shadowkeep Digital Deluxe Edition. Once you finish the first Shadowkeep mission and start to explore the Moon's surface, Eris Morn will have the emblem in her inventory.

Wormslayer

You'll need to destroy all 45 Data Memory Fragments scattered around Mars. Once you do that, this emblem will drop once you open both Golden Age vaults. No longer obtainable since Mars entered the DCV.

Secret Victories

Complete all six (6) Ascendant Challenges.Please note that you'll need to loot the chest and leave via the portal at the end of each challenge; make sure you don't transmat somewhere else before leaving via the portal.Note that as of Destiny 2 v2.8.0 this emblem no longer drops along with any related emblems, you'll need to unlock them all separately.

Emperor's Envy

Successfully complete your first Leviathan, Eater of Worlds raid lair. No longer obtainable after Eater of Worlds entered the DCV.

Honor of the Vanguard

No official drop rate available, but appears to be a very low chance.

Maleficarum Interrupted

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

Prophetic Arsenal

Obtained after completing all of the Lost Prophecy bounties on Mercury. No longer obtainable after Mercury entered the DCV.