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Tachinids are calyptrate flies with a bend in vein m (but not always) and with large, strong abdomenal bristles (but not always) and with a subscutellum (99%) which can't usually be seen in photos. :) The dexiines tend to be longer-legged than other subfamilies but again this isn't a rule - just a rule of thumb. ;)

Often tachinids lay eggs that immediately hatch - the emerged larvae then go looking for a host or lay on the food waiting for a host to come by.

I'm not sure about the oriental region but tachinids are often hard to identify outside Europe :( Theo will know more.