Lucifer wanted God's power and glory. When God announced his plan for us, and the role that Jesus was to play in it, Lucifer put forth a different plan, in which he wanted to play the lead role. Lucifer led a failed rebellion against God, against Jesus, and against God's plan; and as a consequence, has been cast down, and forever denied the ability to progress to the mortal phase that we are now in, let alone anywhere beyond this phase.
As Satan, his fate is already sealed, and he knows that there is nothing that he can do to change it. All he seeks now, all he can seek, is revenge. He wants to damage interfere with God's plan, as much as he can, and to lead as many of us astray as he can. There is no reward for him to achieve, based on how much damage he does, other than the vengeful satisfaction that he hopes to take from it.