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Realistic: a goal must represent an objective toward which you are both willing and able to work. A goal can be both high and realistic; you are the only one who can decide just how high your goal should be. But be sure that every goal represents substantial progress.
So, in case targets are not realistic, you should convince your leader about that issue but providing efficient proofs related to the time, resources, capabilities, materials, etc. Also, you must deliver the feeling that not achieving this unrealistic goals will not just be your problem, but also, the leader's too.
This should be accompanied with forecasts obtained from historical previous achievable sales. Also, this forecast shall be supported with justifications.