Full list of all 57 Riverbond achievements worth 1,100 gamerscore. It takes around 4-5 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 52 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 5 achievements worth 100 Gamerscore.
Collect 35 Stars
Destroy The Knight
Defeat All Bosses
Unlock 35 Skins
Speak with Eldra Highest of High
Collect 25 Stars
Speak with Eldra Rex
Speak with Eldra the Spirit
Begin the eighth adventure
Waste Koke the Crab
Speak with Sunlight-Rising-Boldly
Speak with Spirit-Running-Softly
Begin the seventh adventure
Exterminate Column XVII
Find the secret room in the museum
Speak with Hamdalf
Begin the sixth adventure
Defeat Puffy the Lurker
Speak with Hamdini
Unlock 25 Skins
Find the secret cave in the desert
Speak with Ham Solo
Collect 15 Stars
Begin the fifth adventure
Slay Pumpiron Pengo
Speak with Fur
Speak with Hoota tha Skoota
Begin the fourth adventure
Shatter Romeo Ur-Ribitt
Speak with with Mr. Oopay
Unlock 15 Skins
Speak with BOMB GIRL in the Swamp
Find the secret storage area in the swamp
Begin the third adventure
Wipe Out Rabbitus Maximus
Speak with Larry the Lost
Defeat 20 enemies with any Club
Speak with Peaceful Pig
Begin the second adventure
Wreck Captain Barbacus
Defeat 20 enemies with any Dual Weapon
Speak with Big Bob
Defeat 20 enemies with any Slap Weapon
Defeat 20 enemies with any Spear
Collect 5 Stars
Find the secret beach
Unlock 5 Skins
Complete the tutorial
Defeat 20 enemies with any Gun
Defeat 20 enemies with any Sword
Speak with Waterkeeper Wyn
Begin the first adventure
Defeat Great Cartos
Speak with Brother Honey
Die by Traps 20 Times
Kill 80 Slimes
Begin the Ninth Adventure