1. That may be attained.

2. Obtainable.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sastainable,
• attanable,
• attainible,
• attainble,
• atainable,
• retainable,
• avainable,
• attenable,
• untainable,
• sutainable,
• attainiable,
• abtainable,
• zttainable,
• sttainable,
• wttainable,
• qttainable,
• attinable,
• attianable,
• attainabel,
• attamptable

• attainability.

The adjective form of the word "attainable" is "attainable".

The plural form of the word "attainable" is "attainables".

The singular form of the word "attainable" is "attainable". The word does not have a separate singular form as it is an adjective that can be used to describe a noun in both singular and plural forms.