Experienced Drake Rider

Use a mecha blast rocket right before mounting. You're welcome.

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Looooooong time edit

In Legion at level 110 it seems that they drakes no longer scale at all, making this achievement impossible to do with the tactics on this post

Long time edit

I added this to the comments and never thought about updating the post itself. The damage and health of the drakes seem to scale with your characters level, these were done as a level 90.

Green dragon

Keep 3 stacks of poison on boss, keep dotting adds with 2 stacks. Just keep count which adds got 2 and don't touch them anymore, they die and give you health all the time.

Keep using the sacrifice attack on boss.

Red Dragon

Spam 1 on boss, when little drakes spawn target the little drakes to get massive damage off boss (50% increase with jumps, up to 300k damage on boss)

Use evasive whenever you please but not during the phase where the boss phases out.

Brown Dragon

Sadly this part can't be done as solo, as the brown dragons damage relies on others to build.

If you die during the encounter, you will not get credit towards this achievement. I was riding an Amber Drake(last part of the acheivement i needed) then died, and when Eregos died i was not credited with the acheivement.

So DO NOT DIE if you want this done.