No experience of this myself but my colleague did his.
He found that loads of ice and cold therapy really helped in the early days (similar to treating a horses tendon injury I guess). I lent him my horses Bonner Ice Bandage (he used it over a towel so he didn’t get freezer burns) which is old but still works well and his doctor was impressed at how quickly he’d got the initial inflammation down.
His doctor said that if he was a women he’d recommend wearing the highest pair of shoes to reduce the tension on the Achilles but realized that wouldn’t be so easy for a man!