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Egypt is working to achieve food security reclaiming thousands of feddans of desert ........

a) land b) lands

I go for (a)

Is there anything wrong with the sentence itself?

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"land" is the more likely word in that position. "lands" is not impossible. It has a slightly different "feel".

Omar AhmedIs there anything wrong with the sentence itself?

It needs a comma after "security", or else the word "by" needs to be inserted.

Most English speakers would not know the word "feddan", so for an English-speaking audience it would make sense to convert to an English-language measure.