We actually just added this a couple of weeks ago! The match needs to be parsed with TrueSight (esports, plus subscribers). Here's an example from ESL One Manila: http://www.dotabuff.com/matches/2317015332/
You can see the Veno, Batrider and Tusk all got Aghs from Alchemist. You can hover over the upper-right corner icon to see what time they got it at. You can also see it in the Objective log, it will say something like this:
35:56 Batrider activated Aghanim's Scepter from Alchemist
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I've noticed that DotaBuff currently does not have any notification of when a Hero had been affected by an Aghanim's Upgrade Synth. This is a formal request to see if this is possible, and if so, implement it so that we can readily see if a hero had an Upgrade in the game.