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.
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