How to Memorize

easy to attain, set attainable targets/goals/objectives

Analysis

To 'attain' something means to reach it (attain a speed, attain good grades etc) or to succeed in achieving something. You can 'attain' a PhD in a subject or 'attain' a position in a company for example. You will hear this used more often in professional or formal contexts. 

Professional Examples (Basic)

1. I think my dreams for the future are relatively easy to attain. But I'll still need to work hard.
2. The brand's new business plan contained attainable goals for all departments.
3. Students are encouraged to set attainable objectives at the beginning of each academic year.
4. During my Performance Review, my Boss adjusted my targets so that they were more attainable.

Social Examples (Basic)

1. After school, I hope to attain a qualification in science at university.
2. No matter how much effort I put in I can't seem to attain a mark higher than a C+ in French.

Further Suggestions