When you visit Achiltibuie and have a fine day I strongly recommend that you take a trip around the Summer Isles on the MV Hectoria. The trips take around 3 1/2 hours and includes a stop on Tanera.
There’s lots of amazing wildlife and rock formations to see around the islands. The views back towards the mainland and across Loch Broom & the Minch are spectacular.
I found one holiday-maker’s video on YouTube that will give you a great impression of what to expect.