Here is the full list of all 19 Zoo Seeker achievements.
Find all challenge mode Castle objectives.
Find all challenge mode temple objectives.
Find 100 objectives on online maps.
Find 50 objectives on online maps.
Find 25 objectives on online maps.
Find 5 objectives on online maps.
Find 1 objective on an online map.
Find all challenge mode farming village objectives.
Find all castle objectives.
Find all temple objectives.
Find all farming village objectives.
Find 100 objectives.
Find 50 objectives.
Find 25 objectives.
Find 10 objectives.
Find 1 objective.
Clear the farming village 10 times in challenge mode.
Clear the temple 10 times in challenge mode.
Clear the Castle 10 times in challenge mode.