Because Mormons believe that we originally lived with God as spirits before being sent to this world (see Human Nature), salvation in Mormonism means returning to God after this life.
Mormons believe salvation is attained through a combination of faith in the Atonement of Christ and good works, with emphasis on the good works:
"If you are to return to live with God eternally, you must keep His commandments, accept Jesus Christ’s Atonement, and follow His example while you are on Earth." 
"We believe that through the Atonement of Christ, all mankind may be saved, by obedience to the laws and ordinances of the Gospel.... [the] ordinances of the Gospel are: first, Faith in the Lord Jesus Christ; second, Repentance; third, Baptism by immersion for the remission of sins; fourth, Laying on of hands for the gift of the Holy Ghost" 
To summarize these and other Mormon statements, salvation can be achieved by:
- believing in God and Jesus
- doing good (being kind, fair, loving, etc.)
- developing moral character
- repenting of sins and attaining forgiveness through the Atonement of Christ
- being baptized and participating in other Mormon ordinances
- spreading the Mormon faith 
- "The eternal nature of God's children" at Mormon.org.
- 13 Articles of Faith.
- "The plan of salvation," "Your part in God's plan" and "Why am I here on Earth?"