Here is the full list of all 30 Idle Portal Guardian achievements.
Complete all adventures
Complete your third adventure
Kill total 100 bosses
Quadruple your base firerate
Reach more than 10000 arrow damage
Survive till 750th wave
Reach more than 3000 arrow damage
Triple your base firerate
Reach %70 poison chance
Reach %90 poison chance
Complete your first adventure
Kill total 50 bosses
Survive till 300th wave
Reach %50 poison chance
Triple your arrow range
Max out your arrow range
Kill total 25 bosses
Reach %60 critical chance
Reach %80 critical chance
Survive till 150th wave
Double your arrow range
Reach %40 critical chance
Reach %60 armor penetration
Reach %80 armor penetration
Max out your armor penetration
Kill total 10000 Enemy
Double your base firerate
Kill total 2500 Enemy
Reach more than 500 arrow damage
Kill total 500 Enemy