Here is the full list of all 20 Haunt Chaser achievements.
Get Sent To Purgotary 10 Times
Revive Chaser 10 Times
Trap Entity 6 Times
Hit The Trap 10 Times
Revived By Friend 3 Times
Complete 20 Objectives
Complete 45 Objectives
Complete 80 Objectives
Take 50 Photographs
Banish Entity 5 Times
Use Seal 10 Times
Find Treasure 3 Times
Place Ward 15 Times
Teleport 20 Times
Use Speed 20 Times
Hear 15 Sounds
Send 60 Chasers To Purgatory
Send 40 Chasers To Purgatory
Send 20 Chasers To Purgatory
Win 20 Games