Congratulatory (adjective)

1. Expressive of praise or admiration for an achievement or occasion.
2. Offering or expressing congratulations.

Origin:

Late 18th century: from congratulate + -ory.

Examples:

1. The team received a congratulatory letter from the president.
2. He received many congratulatory messages on his promotion.
3. The congratulatory speech was given by the company's CEO.
4. The congratulatory banner was hung outside the office.
5. She received a congratulatory phone call from her parents.