I need to pickup set of documents from my friend arriving on non-schengen tap flight at 9am and I am flying to non-schengen at 10am. Is there a way we can meet before passport control for arrivals. In Frankfurt arrivals are in the same terminal as departues. I dont know how this works in Lisbon.

AFAIK all non-Schengen arrivals at LIS are treated as unclean, meaning that they are physically separated from departing pax (Schengen or non-Schengen) until landside or after clearing transfer security. (This is the case in FRA and other EU airports for some but not all non-Schengen arrivals too.) So the only place where you could meet up is in the landside arrivals hall, which will be cutting it way too close IMO unless your friend arrives early and there are minimal lines at passport control.

Bottom line: I would not count on being able to meet your friend under the circumstances you described. Plan on finding another way to exchange the documents.

Is your friend flying on to a Schengen destination or terminating in LIS? Are you departing from LIS or connecting from a Schengen flight?

The arrival process for non-Schengen (NS) is:
Arrive > Bus to the NS area/walk off jet bridge >
>if connecting to a NS flight > Security check > you're in the NS departure area
>if terminating in LIS or connecting to a S flight > passport control >
>> if terminating > walk to baggage claim > out the door
>> if connecting to an S flight > security > S area.

If your friend is terminating in LIS - I would suggest meeting landside, but there's a good chance you won't make it.
If your friend is connecting to an S flight - meet in the S area, and you *may* make it.

The only other thing I can think of is trying to convince the NS>NS security to let your friend give you those documents by sending them through the security scanner prior to passport control.

A flight arriving at 9AM probably won't be at passport control until 9:20. At that point it will be last call for you.

Good luck!