Sleeping bag (rated to -5°C) plus inner (sheet sleeping bag), foam or inflatable mattress (Thermarest etc.).
Thermal underwear, fleece top, Gore-Tex jacket, light down jacket, light mountain trousers, warm trousers for evening, 5 pairs of socks, 4 quick-drying tee shirts, shirt with collar (for protecting neck against sunburn), sunhat, warm hat / balaclava, scarf, warm gloves, umbrella for shade at midday, slippers for evenings, plastic sandals for river crossings.
Walking boots that you have worn in - they should be sturdy, but supple, with a good sole, head torch with new and spare batteries, walking poles.
Water bottle (isothermic, at least 1 litre), sunglasses (2 pairs), spare laces for boots, washing bag with toiletries, towel, pocket penknife, mending kit (needle and thread), document wallet (for passport, plane ticket, insurance documents, money), reading and writing materials, binoculars, etc.
Diamox (altitude sickness), painkillers (paracetamol), anti-inflammatories (ibuprofen), one-week course of wide-spectrum antibiotic, anti-diarrhoea and
anti-constipation pills (Sennekot), light sleeping pills, plasters, bandages, antiseptic cream, anti-mosquito ointment, sun cream and lip salve, water
purifying tablets, earplugs, eye lotion, tweezers.
Your own medicines.