It depends on the context. It may be meant genuinely. Sometimes it may be intended to suggest that someone did something cynically in order to gain favour, or to belittle someone's achievements.
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AnonymousThe origin of the phrase is from the points Brownies (junior Girl Scouts) earn for doing various projects.I've always assumed this too, and it's what some dictionaries say. However, other places say that the etymology is uncertain; Wikipedia, for example, gives a whole bunch of suggestions.