I realise you're in the early planning stage but you need to have a closer look at a map, and make some geopolitical considerations.
Turkey - Armenia = border sealed since 1993
Armenia - Azerbaijan = war in 1990-93, border sealed since... have you never heard of the Nagorno Karabakh conflict?
Pakistan - Tajikistan = these countries don't even touch.
Armenia has to be visited either from Georgia or Iran, no big problem though I would highly recommend a visit, even if it's only the capital and a couple of touristy sites nearby.
Getting from Central Asia (e.g. Tajikistan) to Pakistan requires going through China, which is expensive and needs a lot of planning (needs to be arranged through a tour agent). You might make it through Afghanistan, if you deem the risk manageable (I did it the other way in 2009), but you would have to be prepared to get turned back at the Pakistani border and have another option to get out of the country.
My website has a lot of photos and stories from these countries, but for practical advice I would recommend searching this site, and browsing Caravanistan - The Silk Road Travel Guide
EO
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EurasiaOverland a memoir of one quarter of a million kilometres by road through all of the Former USSR, Western and Southern Asia.
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