Walker was President of the Alpine Club in 1891-1893.
In commemoration of his first ascent of the Grandes Jorasses on 30 June 1868, Walker gives his name to Pointe Walker (4,208 m), the highest summit of the mountain; this lends its name to the Walker Spur, the most well-known buttress on the north face and one of the great north faces of the Alps.
- Barre des Écrins with A. W. Moore and Edward Whymper, and guides Michel Croz, Christian Almer the elder, and Christian Almer the younger on 25 June 1864
- Balmhorn (Bernese Alps) with Frank Walker and Lucy Walker, and guides Jakob Anderegg and Melchior Anderegg on 21 July 1864
- Piz Roseg (Bernina Alps) with A. W. Moore, and the guide Jakob Anderegg on 28 June 1865
- Ober Gabelhorn (Pennine Alps) with A. W. Moore, and Jakob Anderegg on 6 July 1865
- Pigne d'Arolla (Pennine Alps) with A. W. Moore, and Jakob Anderegg on 9 July 1865
- Brenva Spur on Mont Blanc with George Spencer Mathews, A. W. Moore, Francis Walker, and the guides Jakob Anderegg and Melchior Anderegg on 15 July 1865
- Grandes Jorasses (Mont Blanc Massif) with guides Melchior Anderegg, Johann Jaun and Julien Grange on 30 June 1868
- Mount Elbrus (Main West Peak, 5642 m) (Caucasus) with F. Crauford Grove, Frederick Gardner, Peter Knubel and guide Ahiya Sottaiev in 1874