I scored 100 in Duolingo. Are there any good colleges that I can target with this score?

A 100 Duolingo score is a bit less. The universities abroad have a pretty high Duolingo acceptance score.   Some of these reputed institutions along with their Duolingo cut-off are listed below– 

Yale University - minimum score 120

Harvard University - minimum score 125

Cornell University - minimum score 120  

NYU Stern School of Business - minimum score 120  

Massachusetts Institute of Technology - minimum score 120 

University of California Berkeley - minimum score 115

University of Pennsylvania - minimum score 120 

Johns Hopkins University - minimum score 120

You need to either give another attempt of Duolingo or give another exam like IELTS or TOEFL. 

If you need any help with the same, just let me know what course do you wish to pursue and also if you have any country preferences. I shall then help you with suitable information.