for my sins

humorous

(humorous) Jokingly suggesting that some ostensibly undesirable task or situation has been assigned as a punishment.

Japanese Meaning

（冗談交じりに）自業自得の罰（感）を受ける、いやいやながらやるべきことや状況が課せられていることを示す表現

I've been put in charge of the office Christmas party, for my sins.

私は罰として職場のクリスマスパーティーの担当を任されてしまっています。

Sense（1）

(humorous) Jokingly suggesting that some ostensibly undesirable task or situation has been assigned as a punishment.

I'm organizing the office Christmas party this year, for my sins.