The transfer marks the end of Pacheco's six-year stay on Merseyside, six years that didn't produce a single goal for the Reds.
From a young age the Spanish striker had been hyped as the new Fernando Torres since he made a few appearances back in 2009.
In the last couple of seasons, the 22-year-old has had to deal with the dreaded loan curse, a move that many young players often don't recover from.
He has been to Norwich City, Rayo Vallecano and Huesca but Alcorcon will now hope to provide some stability for Pacheco.
Liverpool manager Brendan Rodgers has worked hard to bring in attacking players this summer including Iago Aspas, Luis Alberto and Victor Moses which only limit Pacheco's first-team chances even more.
Pacheco isn't the only casualty of the summer recruitment drive, Italian striker Fabio Borini has also been shown the exit door, albeit on loan, to Sunderland.
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