When congratulating someone on achieving success, we generally use the preposition "on".

When congratulating someone on achieving success, we generally use the preposition "on". For example, you can say or write:

Congratulations on your incredible success!

More examples:

Congratulations on building this incredible achievement!

Congratulations on this special achievement!

Congratulations on your prize.

Generally, the noun "congratulations" takes the preposition "on". For example:

• Congratulations on your marriage
• Congratulations on the birth of your baby
• Congratulations on your graduation

Congratulations on the birth of your daughter/son.

When getting a new job, you can use the preposition "on" or "for". Thus, you can say "congratulations on/for your new job."