Can the apple tv(1st gen) have KODI installed on it like the fire stick?

The one from 2008? Why would you? It can only stream in 720p and the processor is almost a decade old at this point. The current Apple TV is absolutely capable of running KODI (as is the second generation box though its no longer receiving updates).

If it's white and looks like a Mac Mini it's the first gen, second and third gen are almost indistinguishable (the little square black pucks). If it is a second gen, it is technically capable if it hasn't been upgraded past a certain firmware version (I forget which), while the third gen isn't possible to install kodi on.