Uno is primarily a casual card game, and it doesn't typically have a competitive ranking system or official achievements like some video games. However, players can still set personal goals and achieve milestones in uno online. Here are a few examples of achievements that players often strive for:

1. Winning Streak: Maintain a long winning streak by consistently winning games against opponents. This can be a personal achievement and a testament to your skill and strategy in the game.
2. High Win Percentage: Aim for a high win percentage by winning a significant portion of your games. This reflects your overall success in Uno and can be a goal to work towards.
3. Beating Skilled Opponents: Defeat skilled opponents or players with high rankings. This can be a challenging achievement and demonstrates your ability to outplay experienced Uno players.
4. Completing Challenges: Some Uno online platforms or apps may have specific challenges or goals that you can aim to complete. These could include winning a certain number of games, playing a specific number of matches, or achieving certain in-game objectives.
5. Unlocking Customization Options: Some Uno games offer customization options for player avatars, card designs, backgrounds, or other elements. Unlocking and collecting these customization options can be a fun achievement and allow you to personalize your Uno experience.

Remember, while achievements in Uno may not have the same significance as in competitive video games, the main goal is to have fun and enjoy playing the game with friends or other players online.