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.
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
Unlock 5 Skins
Defeat 20 enemies with any Spear
Collect 5 Stars
Begin the second adventure
Wreck Captain Barbacus
Defeat 20 enemies with any Sword
Speak with Big Bob
Defeat 20 enemies with any Gun
Speak with Waterkeeper Wyn
Begin the first adventure
Shatter Romeo Ur-Ribitt
Slay Pumpiron Pengo
Defeat Puffy the Lurker
Exterminate Column XVII
Waste Koke the Crab
Destroy The Knight
Defeat All Bosses
Complete the tutorial
Begin the fourth adventure
Begin the fifth adventure
Begin the sixth adventure
Begin the seventh adventure
Begin the eighth adventure
Speak with with Mr. Oopay
Speak with Hoota tha Skoota
Speak with Fur
Speak with Ham Solo
Speak with Hamdini
Speak with Hamdalf
Speak with Spirit-Running-Softly
Speak with Sunlight-Rising-Boldly
Speak with Eldra the Spirit
Speak with Eldra Rex
Speak with Eldra Highest of High
Unlock 25 Skins
Unlock 35 Skins
Collect 15 Stars
Collect 25 Stars
Collect 35 Stars
Find the secret beach
Find the secret cave in the desert
Find the secret room in the museum
Defeat 20 enemies with any Dual Weapon
Defeat 20 enemies with any Slap Weapon
Begin the Ninth Adventure
Speak with Brother Honey
Kill 80 Slimes
Die by Traps 20 Times
Defeat Great Cartos