I've thought of achiever, but I need an adjective. For example: Todd has many achievements; he is ___________.
"Accomplished" may be a good fit. It means either having achieved in many different things, or having mastered a particular body of knowledge.
A "Renaissance Man" is one who excells in many different things. Thomas Jefferson was a Renaissance Man: Statesman, botanist, vintner, writer.
Ella Fitzgerald was an accomplished musician. She performed masterfully for many years, solo and with other singers, in person and in the recording studio.
Prolific would work in many contexts ... the words and paragraph around it would tip people off I would hope.
with your example: Todd has many achievements; he is ___prolific________.
Definition of prolific
1 : producing young or fruit especially freely : fruitful
2 archaic : causing abundant growth, generation, or reproduction
3 : marked by abundant inventiveness or productivity
a prolific composer