An attainable goal is one that can be reached or achieved with hard work and determination.
When we say something is attainable, it means it's not completely impossible to get there. Think about setting a new year's resolution to run a marathon - if you're someone who never runs at all, running 26 miles might sound crazy! But if you start training slowly, you can make progress and work your way up. With patience and effort, even something like that becomes attainable. It doesn't mean it'll be easy or happen overnight, but you have a clear path to follow. In general, people use the word "attain" when they're talking about achieving goals or accomplishments in life - whether big or small.
To gain (an object or desired result).
Example: To attain such a high level of proficiency requires hours of practice each day.
