Some of the listed achievements should be listed as DLC for Destiny 2. Even if the content is free to play and possible without DLC, if it was released with DLC the DLC must be owned to unlock the achievement.
https://www.bungie.net/en/Help/Article/48484Excerpt: "Certain Achievements/Trophies can only be unlocked by owning Forsaken (e.g. a third subclass, reaching the Dreaming City, and 5000 triumph score)."