Here is the full list of all 36 A Highland Song achievements.
Climbed your first peak
Climbed 5 peaks
Climbed 10 peaks
Climbed 25 peaks
Climbed all the peaks
Found a goshawk
Found 3 goshawks
Found 5 goshawks
Found 10 goshawks
Found 15 goshawks
Correctly named 5 peaks
Correctly named 10 peaks
Correctly named 15 peaks
Correctly named 20 peaks
Correctly named every peak
Confirmed a map
Confirmed 3 maps
Confirmed 5 maps
Confirmed 10 maps
Confirmed 20 maps
Confirmed 30 maps
Met an old soldier
Talked to a king
Made a wish
Met a giant
Met a spelunker
Complete a flawless run
Reached the lighthouse
Reached the lighthouse just after Beltane
Reached the lighthouse for Beltane
Met an ice climber
Fly on golden wings
Hear the fisherman's tale in full
Reach the Lighthouse within 3 days
Reach the Lighthouse without sleeping
Blessings on every peak