The trophies and achievements are important to keep the players interested in the game and give to them some interesting challenge. Some will be:

• COMPLETE THE ENCYCLOPEDIA
• DISCOVER ALL THE PLACES IN THE MAP
• COLLECT ALL THE TREASURES
• COMPLETE ALL THE COLLECTIONS
• GET ALL THE EQUIPMENT WITH ALL THE UPGRADES AND UNIQUE SKINS
• GET ALL THE CHARMS

…

Others will be more complicated to archive and it will be regarding kill enemies in some way, maybe liberate a shelter in a concrete way or do something concrete. Here one example:

Bad Luck

If the players lie on the grass during a storm for a long time, it increases the possibility of having a lighting strike.