Here is the full list of all 29 Rift Sweepers achievements.
Lose a mission
Complete a mission
Clear Corrupted Subway
Clear Sewer Buster
Clear Restaurant from nowhere
Clear any map without dying
Kill at least 2 demons by using Ambra
Purchase at least one license
Charge Gas with 1 sec left in Corrupted Subway
Carry all tanks of gasoline alone
Destroy Stipula Spit by shooting it
Destroy a Buccus Fireball by shooting it
Destroy a Coriarius Missile by shooting it
Kill at least 3 demons with John's Mine
Kill at least 3 Elite demons while on Sharp Vision
Kill at least 10 demons with Simon's Sticky Bomb
Kill at least 15 demons with John's Blaster
Kill your teammates by dropping a pizza box on them
Kill at least 2 demons by dropping a pizza box on them
Reach Sweeper level 10
Reach Sweeper level 20
Reach Sweeper level 30
Reach Sweeper level 40
Reach Sweeper level 50
Win with other players 25 times
Attacked by Fraxinus 25 times
Rescue other players 25 times
Kill at least 4 Elite demons while Smoking
Kill at least 3 Conopeum with the Fragmentation Grenade