Here is the full list of all 75 Tennis Manager 2021 achievements.
Recruit a player into the academy
Upgrade an infrastructure
Finish a full season
Played a Match
Reach Legend experience level
Reach Very Experienced level
Reach Experienced level
Upgrade Sport Center to maximum level
Upgrade Tennis School to maximum level
Upgrade Business Center to maximum level
Upgrade Medical Center to maximum level
Finish 5 seasons
Finish 10 seasons
Finish 30 seasons