The Bug

Upon using a spectral arrow on any mob it will not give you the achievement "Take aim". Every other arrow, including special arrows, give the advancement except for spectral arrows.

How To Reproduce

Step 1. Load into a world (Creative)

Step 2. Get spectral arrows

Step 3. Shoot any mob using a bow with these arrows

If this is not a bug then i believe a correction to the advancement would be recommended as it would technically be misleading to say all arrows give the achievement